FMS and Navigation Flashcards
(141 cards)
1
Q
FMS and Navigation
Which Air Data Module (ADM) sends its info directly to the IFSD ?
A
The CENTER ADM.
2
Q
FMS and Navigation
If voted ADRS Air data is invalid, what is the next backup system ?
A
Backup Airspeed and Backup altitude information is sent to the PFDs.
Backup airspeed is based on AoA and data from the IRS.
Backup altitude is provided by GPS data.
3
Q
FMS and Navigation
If Backup Airspeed and Altitude are invalid, what is the next backup ?
A
ISFD altitude and airspeed will be displayed on both PFDs.
4
Q
FMS and Navigation
Can the IRS be realigned in flight ?
A
Yes, if GPS data is available.
5
Q
FMS and Navigation
What is the IRS composed of ?
A
2 IRS each containing :
- 1 IRU (Inertial Reference Unit)
- 1 AHRU (Attitude Heading Reference Unit)
6
Q
FMS and Navigation
In case of failure of the 3 FMCs, how can navigation be achieved ?
A
Through the Alternate Navigation feature of the TCPs.
It is accessed by pressing the NAV button on the TCP.
Alternate navigation data is displayed on the TCPs and the ISFD.
7
Q
FMS and Navigation
What is ANP : Actual Navigation Performance ?
A
ANP is the FMS position accuracy.
It can be visualized as a circle that contains all possible computed aircraft positions.
The aircraft is assumed to be within this circle 95% of the time.
8
Q
FMS and Navigation
When starting a descent before the computed TOD, by using the “descend now” prompt, what initial rate of descent will be commanded ?
A
Approximately 1250 ft/min.
The DESCEND NOW prompt is available until 50 NM from the TOD.
9
Q
FMS and Navigation
When will the VNAV mode switch from VNAV PATH to VNAV SPD during descent ?
A
If more than 150 ft above or below the VNAV Path.
10
Q
FMS and Navigation
When is ILS autotuning inhibited ?
A
For 10 minutes after take-off and during manual tuning.
11
Q
FMS and Navigation
What is the difference between OPT and RCMD FLs on the VNAV CRZ page ?
A
The RCMD (Recommended) speed takes into account forecast winds and temperatures at cruise altitudes. The FMC evaluates FLs from 9000 feet below the current CRZ FL up to the max FL.
11
Q
What is the function of the CDU Line Select keys?
A
• moves data from scratchpad to selected line• moves data from selected line to scratchpad• selects page, procedure, or performance mode as applicable• deletes data from selected line when DELETE displays in scratchpad
12
Q
What is the purpose of the CDU Help Window?
A
Displays error/help messages to the crew.
13
Q
If LEGS page 1/3 is displayed, which key(s) would you press to display LEGS page 3/3?
A
PREV PAGE Key once, or NEXT PAGE twice.
14
Q
How is required entry of data that is mandatory for FMS operation indicated on appropriate CDU pages?
A
Boxes
15
Q
What is indicated by “dashes” adjacent to line select keys on some CDU pages?
A
Data input is optional.
16
Q
a. What colour are “not yet” executed flight plan modifications?b. What colour is used to indicate an active way point, speed or altitude?c. What colour are the input fields?
A
a. Black text on a white background.b. Magenta.c. Shaded gray.
17
Q
a. How is a highlight box displayed?b. What actions can you make with a highlightbox?
A
a. Hovering the cursor over an active area of the CDU.b. An action may be performed such as data entry or line key selection.
18
Q
What is the autotabbing feature?
A
To facilitate data entry during preflight, when data is entered into a field, the cursor automatically moves to the next appropriate entry field.
19
Q
What does the CDU LEGS page entry W060-10 in the active line produce?
A
Adds waypoints starting at W060 in ten degree increments from that point to the destination
20
Q
Define the E/D (end of descent) point.
A
• The E/D is located 50 feet above the runway threshold for all approaches except VOR approaches.• The E/D for VOR approaches is the missed approach point; which may be the VOR, runway waypoint or a named waypoint.• During cruise, an E/D is also created when an altitude constraint is entered on the LEGS page on a downstream waypoint.
21
Q
Under VNAV control, what crew action is necessary for an automatic descent to commence at the T/D (top of descent) point?
A
Set the MCP altitude to below that of the aircraft.
22
Q
During VNAV controlled descents, what target speed is normally commanded by the FMC?
A
Economy speed above 10,000 ft and 240 Knots below 10,000 ft.
23
Q
On the CDU LEGS page, for example, how would you differentiate between an entry of FL230 and a speed of 230 Knots?
A
Speed must be following by a slash (/).
24
a. How many databases does the FMC contain?b. Which database is regularly updated every 28 days?
a. Three: Navigation, Option Settings and Performance.b. Navigation.
25
How many sets of navigation data are contained in the FMC?
Two.
26
After an electrical power interruption, the FMC will restart. What crew action is required to reactivate the route?
• Performance data displayed on the PERF INIT page must be re-entered.• Modify the active waypoint to activate LNAV.
27
At power up, how are the three FMCs designated?
Master (active), spare (standby) and backup.
28
What happens if the master FMC fails?
• The spare (standby) FMC automatically becomes active and assumes all FMC functionality in the event the master FMC fails.• The backup FMC then assumes the role of the spare FMC
29
a. What happens in the event of a dual FMC failure? b. What crew action will be required?c. Why may a software reset be required?
a. The third FMC automatically takes over in a single FMC configuration.b. The flight crew need store activate and execute the flight plan,and reselect LNAV and VNAV.c. This is a self-protection mode which prevents permanent loss of the FMC in the unlikely event the FMC is presented with an insoluble computation.
30
a. What functionality is lost if a triple FMC failure occurs?b. What navigational capability remains?
a. PFD mini-maps, ND map displays, CDU pages on the MFD and loss of both LNAV and VNAV.b. The TCPs provide the capability to enter a single Lat/Long waypoint. The TCPs then provide track, distance to go, and groundspeed for the entered waypoint.
31
a. How are the crew made aware of pending uplink messages via the CDU? b. What indications are there on the EICAS?
a. ACCEPT/REJECT or LOAD/PURGE prompts, FMC modification ERASE prompt or EXEC key, or when the page with the uplink is selected.b. An •FMC EICAS comms alert and a hi–lo chime.
32
What prompt appears on either the RTE or WIND page after the receipt of uplink data?
LOAD.
33
a. What prompts appear after the uplink has been loaded? b. Selecting either of these prompts does what?
a. The EXEC light illuminates and the ERASE prompt displays.b.• Selecting the EXEC key puts the modified data in the active flight plan and changes the page format to pre–uplink format.• Selecting the ERASE prompt removes the modified data and returns the page display to the pre–uplink format
34
What displays on the FMC COMM page to alert the crew of pending uplink messages?
The page line title displays UPLINK.
35
Which page is automatically displayed on the FMS CDU when electrical power is initially applied to the aircraft?
The IDENT page.
36
a. What is the sequence of pages used in the initial pre-flight check of the FMC?b. What supplementary CDU pages can be used during the pre-flight check?
a. IDENT, POS REF, RTE, DEPARTURES, NAV RAD, PERF INIT, THRUST LIM, TAKEOFF REF pages 1 & 2.b. ARRIVALS, RTE LEGS, ALTN, REF NAV DATA, VNAV, WIND.
37
a. Which CDU page allows you to change the method of FMC position updating?b. How could you verify that the FMC was using GPS-IRU updating?
a. POS REF page 2/4 (UPDATE/ARM prompt).b. Check FMC position line suffix (in brackets) on POS REF page 2/4.
38
POS REF page 2/4 displays the Required Navigation Performance and Actual Navigation Performance (RNP/ACTUAL). What EICAS caution displays if ACTUAL exceeds RNP?
NAV UNABLE RNP
39
a. Which CDU page displays the calculated positions of all three FMCs?b. What other functions does this page enable crews to do?
a. POS REF page 3/4.b. Enable or inhibit position updating modes used by the FMC.
40
a. What information is displayed on POS REF page 4/4? b. What capability does this page provide for the crew?
a. Displays the present position of individual navigation sensors in bearing/distance format from the Master FMC position.b. To remove specific sensors from the FMC navigation solution.
41
What change is there to the colour of the RTE page title when the route is activated and executed?
It changes from cyan to white.
42
What is the purpose of the RTE copy facility on the ROUTE page?
It copies the entire active route (RTE 1 say) into the inactive route (RTE 2).
43
Which CDU function key must be pressed to display the available SID's?
DEP ARR – displays page to input or change departure and arrival procedures.
44
When checking the NAV RAD page on pre-flight, what action would you take (if any) if you saw a white ‘M’ between a VOR frequency and ident?
Press the DELETE key on the MFK, and line select to line 1L or R as appropriate (releases the VOR for automatic tuning).
45
What is the Cost Index (CI) used for?
It is used by the FMC to calculate the ECON CLB, CRZ and DES speeds.
46
a. Would a low CI result in a low or high ECON speed? b. What does a CI of zero produce as a speed?
a. A low ECON speed.b. Maximum Range Speed
47
What happens if an assumed temperature (SEL) is entered on the THRUST LIM page after the take-off speeds have already been accepted?
The takeoff speeds are deleted and the CDU help window message TAKEOFF SPEEDS DELETED is displayed.
48
What entry is required on the TAKEOFF REF page 1/2 before the FMC calculated stabiliser trim setting appears?
Centre of Gravity (CG) within valid range.
49
a. What information is entered in the RWY/POS line on the TAKEOFF REF page 1/2?b. Can the crew manually enter data onto this line if required?c. When is the RWY/POS update inhibited?
a. The selected take off runway, and TO/GA push distance from the runway threshold or runway intersection identification.b. Yes.c. When GPS is primary FMC navigation source
50
a. What appears on the TAKEOFF REF page 1/2 when the preflight entries are complete?b. Does it appear on any other CDU pages?
a. The line 6 header displays FMC PREFLIGHT COMPLETE in white letters on a green background.b. Yes, the PERF INIT and THRUST LIM pages.
51
a. During a VNAV climb, the profile is such that an altitude constraint will not be achieved; what CDU help message appears?b. Which CDU page displays the predicted error?c. How do you access this page?
a. UNABLE NEXT ALTITUDEb. The CLB page, ERROR at waypoint line. c. Selecting the VNAV function key.
52
Which CDU page, and line would you select to comply with an ATC request to maintain 240kts up to 8000 feet?
CLB page, SPD RESTR line.
53
On the CLB page, what is the significance of the parameters coloured magenta?
They are the current FMC commanded parameters.
54
If ATC stated that speed was unrestricted below 10,000ft, how would you climb at ECON speed?
Press DEL key (DELETE in scratchpad), line select DELETE into SPD TRANS line and execute.
55
During a VNAV climb, if the title of the CLB page is 'ACT MCP SPD CLB', how is speed being controlled?
From the AFDS Mode Control Panel (MCP) – by speed intervention.
56
The transition altitude (TRANS ALT) displayed on the CLB is for which airport?
The origin airport.
57
During a VNAV climb, using the CDU how would you delete all the altitude constraints between the current aircraft altitude and the MCP target altitude?
On the CLB page, line select the CLB DIR prompt and EXECUTE.
58
On which CDU page are speed and altitude constraints entered and displayed?
RTE LEGS page.
59
What do the following altitude constraints mean? a. 8000Ab. 6000Bc. 220A240B
a. Cross at or above 8000feet.b. Cross at or below 6000feet.c. Cross between FL220 and FL240.
60
What does adjacent to a waypoint line on the RTE LEGS page mean?
The map centre step (MAP CTR STEP) function is active with that waypoint is centred on the ND.
61
During the climb, less than 400 miles from the origin airport or halfway to the destination, which page will display if the DEP ARR function key is selected?
The ARRIVALS page for the origin airport.
62
What action is required on the RTE LEGS page before the prompts ABEAM PTS and RTE COPY become visible?
Modify the active waypoint to create a MOD RTE LEGS page.
63
What CDU entry could you make to fly a course of 150o from your present position?
P/P150 on RTE LEGS page 1 active line.
64
What CDU entry could you make if you wished to fly the 318 radial from RADDY?
RADDY 318 on RTE LEGS page 1 active line.
65
a. In flight, on which CDU page would you find the OFFSET prompt?b. Up to how many miles can an offset be flown?c. What would be the entry to fly 10 miles left of the route?
a. RTE page 1.b. 99 nm.c. L10.
66
What is the ECON speed?
Economy cruise speed based on cost index.
67
Do the Destination ETA/FUEL predictions on the CRZ page take step climbs into account?
Yes.
68
a. If ATC cleared you for a step climb to FL370 at waypoint ABC, what entry would you make into the CDU?b. On arrival at ABC, what action would you take to initiate the step climb?
a. 370S on the LEGS page, and line select opposite the waypoint ABC.b. Select 37000 in the MCP window and push the altitude selector as for climb.
69
On which page is the maximum altitude displayed?
CRZ page
70
If the FMC predicts that a step climb is necessary, what information is displayed on the CRZ page?
The AT line displays ETA/DTG to the optimum step climb point, or "NOW" if the step climb point has been passed.
71
a. If a navigation radio is totally unserviceable, how can you inhibit reception of the data?b. How can you inhibit VOR/DME updating from ALL navaids?c. When b) is complete, what is displayed on the VOR ONLY INHIBIT line?
a. Select REF NAVDATA page from INIT/REF Index. Enter nav aid identifier in the NAVAID INHIBIT line.b. Push prompt so that 'OFF' appears on the VOR/DME NAV line on REF NAV DATA page.c. 'ALL' (in both locations).
72
How could you see how far along the route you would reach the MSA at 3500 ft?
Press FIX function key: enter 3500 in the PRED ETA-ALT line. A green circle will be displayed on the ND showing the position on the route at 3500ft.
73
With the RTE LEGS page displayed, you wish to insert wind information for a waypoint near the top of climb:a. Which CDU page do you select?b. How is this selection accomplished?
a. RTE DATA.b. Push the line select key opposite RTE DATA (6R)
74
On the RTE DATA Page 1/3, what indicates that wind data has been entered for a particular waypoint?
The symbol W> appears on the right hand side, against the appropriate waypoint.
75
a. For a particular waypoint, how many lines/altitudes of wind data can be inserted?b. When entering the wind data manually, does it matter in which order the altitudes are entered?
a. Four.b. No, the display sorts to ascending order.
76
If you knew that the temp at FL330 was -50oC at a waypoint, how could you determine the temp at the same FL’s as the wind data?
Enter 330/-50 on the ALT/OAT line of the waypoint wind page and execute.
77
How is the POS REPORT page accessed?
Either: press POS REPORT prompt on PROGRESS page 1/4 or press FMC COMM key, then POS REPORT prompt
78
The DEST line on PROGRESS page 1 is overwritten with an en-route waypoint. Do the resultant ETA/fuel estimates assume direct flight to the waypoint, or via the LNAV route?
Flight via the LNAV route.
79
Which CDU page should be displayed to view fuel remaining estimates for the next two waypoints?
PROGRESS page 1/4.
80
a. What method is used by the FMC to display the CALCULATED fuel quantity?b. How is this method affected after fuel jettison?
a. After engine start, the CALCULATED fuel quantity is decreased by the fuel flow sensing system (FUEL USED).b. Value resets to the fuel quantity calculated by the fuel totalizer system.
81
What is the reference for the wind information displayed on PROGRESS page 2?
True north.
82
What is accomplished by selecting the USE prompt on PROGRESS page 2 when directed by a QRH checklist?
Selects the method to calculate fuel quantity, either TOTALIZER or CALCULATED.
83
If you were required to be at KOK at 1530z, which page would you select to enter the data for this required time of arrival?
RTA PROGRESS Page 3/4.
84
On RNP PROGRESS page 4/4, can the crew enter lateral and vertical RNP values manually?
Yes.
85
You have some updated wind data for the descent. On which CDU page would you insert the information?
DESCENT FORECAST page.
86
After entry of an arrival, which CDU page displays the Transition Level?
DESCENT FORECAST page.
87
You are off the LNAV route, and want to know whether you can descend ‘clean’ to make BNN at FL 70, what CDU actions are necessary?
Push the OFFPATH DES prompt on the DES page. Enter BNN and FL70 on top line; note the sign of the range under 'TO CLEAN' prompt. A minus sign; it's too late you'll need speedbrakes!
88
What is the purpose of the INTC> prompt on the ARRIVALS page?
The intercept is normally the initial approach fix (IAF) for the current active approach. Selecting the INTC> prompt displays the LEGS page with an intercept course to the approach fix.
89
What is the purpose of the FLAP/SPEED prompt on the APPROACH REF page?
Entry of the desired flap position and VREF speed displays the VREF speed on the PFD.
90
How would you enter a hold at LOGAN, if the hold page is already displaying a hold at LAM?
Push box.
91
If a hold is entered at a waypoint that has a constraint of 7,000ft, will the hold target altitude automatically display 7,000ft?
Yes
92
a. On the HOLD page, what does HOLD AVAIL 0+48 mean?b. What should you enter on the EFC TIME line?c. Which FMC predictions does this affect?
a. 48 minutes of holding time available before requiring reserve fuel to reach the destination.b. Your Expected Further Clearance time.c. Down route ETA's and fuel predictions.
93
How could you access the ALTN page?
By pressing the ALTN function key, or by pushing the ALTN prompt on the RTE 1/X, INIT REF INDEX and FMC COMM pages.
94
a. Is the currently selected alternate airport displayed on the ND map display?b. Is any crew action necessary to display the other 3 alternate airports?c. How are alternate airports displayed on the ND if they are located beyond the 1280 mile map range?
a. Yes, at all times.b. Press the ARPT switch on the EFIS control panel.c. As directional arrows with the ICAO identifier and distance in NM.
95
a. What is the order (top to bottom) of the airfields listed on ALTN page 1?b. How would you know which airfield had been chosen automatically by the FMC?
a. ETA order when airborne, and in distance order on the ground.b. It is identified with the prompt
96
When the XXXX ALTN airfield page is displayed, what are the 3 route options available to the airfield concerned?
DIRECT TO, OFFSET and OVERHEAD.
97
In the unlikely event that an unrecoverable loss of all displays or loss of all three FMCs occurs, how is the backup navigation capability accessed?
Pushing the NAV key on the TCP.
98
Where is the backup navigation information displayed?
On the TCPs and ISFD.
99
Which of the following functions are available in alternate navigation:- LNAV?- VNAV?- Autopilot?- Autothrottle?
- No- No- Maybe- Maybe
100
Which two TCP alternate navigation pages are available?
• ALTN NAV• ALTN NAV RADIO
101
The ALTN NAV page provides a stand alone, single waypoint navigation capability. Once the waypoint’s latitude and longitude has been entered on the page, what flight progress information is then displayed?
• Track to the waypoint.• DTG in nm (accuracy better or equal to 10nm).• TTG in HH:MM format (accuracy better or equal to 1min).• Left INR true ground track & true ground speed.
102
a. Which navaids can be tuned on the ALTN NAV RADIO page?b. Where are the course deviations for these navaids be displayed?
a. ILS and GLS.b. The ISFD.
104
a. Which systems supplies position information to the FMCs?b. What happens in the event of an IRS failure?
a. Left and right GPS receivers are independent and supply very accurate position data to the IRS. The IRS in turn supplies a very accurate hybrid GPS-inertial position to the FMC.b. The GPS supplies position and track data directly to the FMC
105
How many pitot/static systems supply air data to the Air Data Reference System (ADRS)?
Three, left, center and right.
106
If voted ADRS air data is invalid and the AIR DATA/ATT switch is in AUTO, which systems supply backup airspeed and /or altitude?
Backup airspeed (AOA SPD) and/or backup altitude (GPS ALT) are automatically provided by the IRS and GPS systems.
107
What is the source of altitude and airspeed if both voted and backup air data is unavailable?
Integrated Standby Flight Display (ISFD) altitude and airspeed are displayed on the PFDs
108
What are the major components of the Inertial Reference System (IRS)?
The inertial reference units (IRUs), and attitude and heading reference units (AHRUs)
109
How do the IRUs compute position information?
The IRUs combine inertial reference functions with GPS position information to provide hybrid GPS-inertial position output
110
a. What power is required for initial IRS alignment?b. Are attitude and heading/track shown on the PFD during alignment?
a. Battery bus power. b. No.
111
On the ground, if electrical power is removed, and the battery switched off, leaving the IRS switches ON; what happens?
The hot battery bus continues to supply power to the IRS, the ON BAT light illuminates and the ground crew call horn sounds.
112
When must the crew enter the aircraft position on the CDU POS INIT page?
If the GPS position is not available during the alignment.
113
What do the following CDU help window messages indicate?a. INERTIAL/ORIGIN DISAGREE b. ENTER INERTIAL POSITION c. ALIGNMENT REINITIATED
a. The latitude/longitude position is not close to the position of the origin airport.b. The crew–entered latitude/longitude position does not pass internal IRU comparison tests.c. The new airplane present position entry fails the internal check twice. The system automatically starts a new alignment cycle
114
a. What, if anything, can be done after a power interrupt causes an in-flight loss of alignment of an IRU?b. When is this capability not available?
a. The IRU can complete an alignment whilst in flight.b. When the GPS receivers are not functioning
115
How long can the IRU remain in NAV mode before a position update?
A position update is recommended if the total time in the navigation mode is expected to exceed 18 hours
116
In the event of both IRUs failing, which systems supply position information to the FMC?
A hybrid GPS-inertial position solution using the AHRUs inertial sensors combined with GPS position.
117
a. What has happened if the EICAS caution message NAV INERTIAL SYSdisplays?b. Are the LNAV/VNAV AFDS modes still available?c. Are the ND map modes still available?
a. Both AHRUs and both IRUs have failed.b. No.c. Yes.
118
If the NAV INERTIAL SYS message is displayed, which systems provide the following data: -(Refer to the FCOM IRS Schematic ‘With NAV INERTIAL SYS Message’)a. Altitude/airspeed?b. Attitude?c. Heading?d. Positionandtrackdata?
a. ADRS.b. ISFD.c. Heading must be manually set on the CDU POS INIT page.d. GPS
119
How many ADF systems are fitted?
Two.
120
Are the ADF systems tuned manually or automatically?
Manually tuned from the left or right CDU on the NAV RADIO page.
121
Where are the left and right ADF bearings automatically displayed?
PFD mini-maps.
122
What manual entry must be made to tune an ADF for BFO reception?
The frequency and suffix letter "B".
123
How many ILS receivers are installed?
Two.
124
How is the ILS frequency and front course selected?
They are usually tuned by the FMC, but can be tuned manually on the NAV RADIO page.
125
What two conditions must be met for FMC ILS autotuning to occur?
1. An ILS, LOC, back course, LDA or SDF approach selected to the active route.2. The airplane is within 50 NM from the top of descent, 150 NM of the landing runway threshold, or the FMC is in descent mode.
126
ILS autotuning is inhibited for 10 minutes after initial takeoff. What must be done if an immediate return to the origin airport is required?
Selection and execution of a new approach in the active flight plan causes the ILS to autotune to the new approach frequency, even if this is accomplished during the 10 minute takeoff inhibit period.
127
How can the ILS be tuned if all three FMC’s have failed?
The left ILS can be tuned from ALTN NAV RADIO page 2/2 on the TCP
128
What does the word PARK adjacent to the ILS - GLS line on the NAV RADIO page mean?
The ILS or GLS is not being used and is not tuned.
129
How many VOR/DME systems are installed?
Two.
130
Can the VOR/DME systems be automatically tuned by the FMC?
Yes.
131
What tuning methods are indicated by the white letters P; R; A and M on the NAV RAD page adjacent to the tuned VORs?
• P (procedure autotuning)–FMC selects nav aids for approach or departure procedure guidance.• R (route autotuning)–FMC selects nav aids on the active route.• A (autotuning)–FMC selects a nav aid for best position orientation.• M (manual)–VOR is manually tuned
132
Is the current radial for a tuned VOR/DME displayed on the NAV RAD page?
Yes.
133
How are the two transponders controlled?
Through the TCP and ATP.
134
a. What specified transponder/TCAS control is available with the ATP?b. What happens if the ATP fails?
a. The ATP controls the Transponder/TCAS modes.b. The Transponder/TCAS modes can be set through the backup function of the TCP.
135
a. Selecting the XPDR mode select key accesses the transponder control pages on the TCP. What transponder controls are available?b. What do the Captain’s and First Officer’s TCP’s share control of?
a.• Altitude Mode (Absolute or Relative).• ATC IDENT function.• Mode A numeric code.• TCAS envelope (Above, Normal ,or Below).• Transponder select (Left or Right).b. • IDENT function• left or right side selection• XPDR code
136
What happens if the on-side transponder fails?
The TCP automatically switches to the cross-side transponder.
137
How is the weather radar controlled?
Through the TCP.
138
a. Which controls are used to activate the radar and display returns on an ND and/or mini-map?b. What must be selected on first to allow these controls to work?
a. The WXR switch on the EFIS control panel and the WXR check box on the ND drop-down menu.b. At least one weather radar system must be selected ON from the TCP SYS POWER screen.
139
What is the maximum range that weather returns can be seen on the ND?
320 NM.
140
What is the maximum range at which turbulence returns are processed?
40 NM.
141
What colour is used to display turbulence?
Magenta
