Chapter 5 CH47

Question 1

The minimum crew required to fly this helicopter is ___. Additional crew members, as required, will be added at ___.

Answer 1

– two pilots and a flight engineer.
– the discretion of the commander, in accordance with pertinent Department of the Army directives.

Question 2

Engine Oil Pressure Limits:

Engine oil pressure limitations are displayed digitally on the ___. The displays appear in green when the pressure is ___, change to yellow if the pressure is > ___, and change to red when the pressure is < ___ or greater than ___.

Answer 2

– POWER TRAIN page by pressing key T6
– 5 to 90psi
– 90psi
– 5psi, 110psi

Question 3

Engine Oil Pressure limits:

Min. Pressure for NG at ground idle - ___
Min. Pressure for NG between 80-95% - ___
Min. Pressure for NG equal to or > 95% - ___
Normal operation - ___
Max. for Contingency power - ___
Max. for cold weather starts - ___

Answer 3

– 5 psi
– 32 psi
– 50 psi
– 35 - 90 psi
– 110 psi
– 150 psi

Question 4

Engine Oil Temperature Limits:

Engine oil temperature limits are displayed digitally on the ___. The displays appear in green when temp. is equal to or < ___, and changes to red, with respective ENG1 (2) OIL HOT caution displayed, when the temp. is > ___.

Answer 4

– Power Train page
– 149* C
– 149* C

Question 5

Maximum Engine Oil Temp. Limit - ___

Answer 5

149* C

Question 6

Engine Transmission Oil Temperature Limits:

Engine transmission oil temp. is displayed digitally on the ___. The display appears in green when temperature is ___, and changes to red when temperature is ___. An ENG1(2) XMSN warning will be displayed when the temp. is ___.

Answer 6

– Power Train page
– equal to or < 140* C
– > 140* C with respective COMB, AFT, or FWD XMSN OIL HOT caution displayed.
– 190* C

Question 7

Transmission Oil Temperature Limits:

Combining, aft, and forward transmission oil temperatures limits are displayed digitally on the ___. The displays appear in green when the temp. is ___ and change to red when the temp is ___ with the respective COMB, AFT, or FWD XMSN OIL HOT caution displayed.

Maximum Transmission Oil Temp. Limit - ___

Answer 7

– POWER TRAIN page
– < or equal to 140* C
– > 140* C

– 140* C

Question 8

Transmission Oil Pressure Limits:

The display appears in green when pressure is ___, and changes to red when the pressure is ___. An ENG1, ENG2, COMB, AFT, or FWD XMSN PRESS LO caution is displayed if the pressure in any transmission is ___An ENG1, ENG2, COMB, AFT, or FWD XMSN PRESS HI advisory is displayed when the pressure in any transmission is ___

Answer 8

–>= 20psi
– < 20psi and NR is >= 25%.
– < 20psi and NR is >= 25%
– > 90psi.

Question 9

Transmission Oil Pressure Limits:

Min. at Ground Idle - ___
Min. at 100% NR - ___
Normal Operation - ___

Answer 9

– 7 psi
– 20 psi
– 20 - 90 psi

Question 10

Hydraulic System Limitations:

Hydraulic system pressures and temps. for the No.1 flight boost system, No.2 flight boost system, and utility hydraulic system are displayed on the ___. The respective No.1 (No.2) HYD FLT CONTR caution will be displayed when ___.

Answer 10

– Maintenance Panel
– hydraulic pressure is < approximately 1800 psi.

Question 11

Rotor Limitations:

Rotor RPM (NR) is displayed digitally on the ___. If NR is outside of normal operating range, it will be displayed on the INST page and ___. Should ___ NR power-off be inadvertently exceeded, no entry need be made on DA Form 2408-13-1 unless the rotor system accelerates and exceeds ___ NR. Even though no action is required when NR exceeds ___ power-off, but remains at or below ___, willful operation shall not be conducted in this range.

Answer 11

– INST page.
– below the VSD/VSDH torque tape.
– 108%
– 111.5%
– 108%
– 111.5%

Question 12

NR Limits:

Minimum transient power on - ___
Transient - ___
Normal - ___
Transient - ___
Maximum transient power on - ___
Maximum during autorotation - ___
Maximum transient - ___

Answer 12

– 91%
– 91 to 97%
– 97 to 101%
– 101 to 106%
– 106%
– 108%
– 111%

Question 13

Cruise Guide Indicator:

The Cruise Guide Indicator (CGI) is displayed on the ___. The scale is displayed with four color range bands: ___. When the CGI TEST switch is moved from the center position to each test position, the pointer on the indicator should indicate within the white test band. The white test band indicates ___. Flight equal to or < ___ with an inoperative CGI is ___.

Answer 13

– VSD.
– green, yellow, red, and white.
– proper system operation.
– 98% NR
– prohibited.

Question 14

Starting and Shutdown Limits:

The APU shall not be started with a tailwind in excess of ___. Main engines shall not be started with a tailwind in excess of ___. If it becomes necessary to shutdown in conditions outside the limits shown in Fig. 5-6/5-7, the following precautions are recommended:

– Aircraft should land in an area which is clear, as level as possible, and at least ___ away from any vertical obstructions, abrupt changes in ground terrain, trees, bushes, fences, etc.
– Aircraft should be oriented such that the wind would ___. If the pilot is unsure of the wind direction after landing, a crew member should be ___.

Answer 14

– 25 knots.
– 10 knots.

– 300 feet
– be coming in at the left side.
–dispatched beyond the rotorwash to make a true wind direction determination before the engines are secured.

Question 15

Hydraulic System Limitations:

Flight Control Hydraulic Pressure:
– Low limit - ___
– Normal (green) - ___
– High limit - ___

Answer 15

– 2500 psi
– 2500 - 3200 psi
– 3200 psi

Question 16

Hydraulic System Limitations:

Utility System Hydraulic Pressure:
– Low limit - ___
– Normal (green) - ___
– High limit - ___

Answer 16

– 2500 psi
– 2500 - 3500 psi
– 3500 psi

Question 17

Hydraulic System Limitations:

Hydraulic System Temperature:
– Red/White - ___
– Yellow/White - ___
– Green - ___

Answer 17

120* C maximum
95 - 120* C
-70 - 95* C

Question 18

Cruise Guide Scale:
– Green - ___
– Yellow - ___
– Red - ___
– White - ___

Answer 18

– Normal operation
– Transient
– Avoid
– Test

Question 19

Engine Temperature Limits:

The engine Power Turbine Inlet Temperature (PTIT) for both engines are displayed on the ___. The digital display and tapes on the scale appear in green for temperatures equal to or < ___, change to yellow when > ___, and change to red when equal to or > ___.

Answer 19

– INST page
– 816* C
– 816* C to 932* C
– 932* C

Question 20

Engine Temperature Limits:

If the PTIT in either engine is equal to or > 816C, the ___ will be displayed. If the PTIT in either engine is equal to or > 854C, the ___ will be displayed. Should the temperature reach 899*C for ___ or longer, the ___.

Answer 20

– ENG 1(2) 30M TMP advisory
– ENG 1(2) 10M TMP advisory
– 2 seconds, ENG 1(2) 2.5 TMP advisory

Question 21

Engine Temperature Limits:

The ENG 1(2) advisory will be displayed before actually reaching contingency power, providing a ___ to advise the pilot he is about to enter this range.

Answer 21

5* buffer

Question 22

Power Turbine Inlet Temperature (PTIT) Limits:

Max. Continuous - ___
Max. for not more than 30 min. - ___
Max. for not more than 10 min. - ___
Max. for not more than 2.5 min. (contingency power) - ___
Max. Transient for not more than 12 sec. (never exceed) - ___
Max. Transient for not more than 4 sec. (never exceed) - ___

-31 ECU only: Transients > 943* C for more than 4 sec. will not be displayed on the INST page but instead “EF” code shall be annunciated on the ECU BIT display.

Answer 22

– 816* C
– 854* C
– 899* C
– 932* C
– 943* C
– > 943* C

Question 23

Contingency Power:

Contingency power is only to be used during actual emergency conditions. Usage of contingency power up to ___ is permissible for an unlimited number of occurrences, as long as each occurrence is ___. Transient power ___ is not to be > ___. If PTIT in either engine is equal to or > ___, ___ will be displayed, also a ___ will be displayed.

Answer 23

– 932* C
– 2 min. 30 sec. or less
– 932* to 943* C PTIT, 12 sec.
– 932*, ENG 1(2) 12S TMP advisory
– ENG 1(2) TEMP HI (CAUTION)

Question 24

Gas Generator (NG) Limits:

Engine gas generator speed is digitally shown in green when NG is between ___, changes to yellow when < ___, and changes to red when > ___. Speeds and limits are displayed on the ___.

Answer 24

– 50 to 111%
– 50%
– 111%
– INST page

Question 25

Gas Generator (NG) Limits:

Ground Idle Min. - ___
Max. - ___

Answer 25

– 50%
– 111%

Question 26

Power Turbine (NP) Limits:

A power turbine (NP) overspeed may exist, depending on ___. The maximum limit for power turbine (NP) is ___. NP speeds and limits are displayed on the ___

Answer 26

– power being used when 106% NP is exceeded.
– 111.5%
– INST page.

Question 27

Engine Overspeed:

An NG overspeed exists ___. An NG overspeed can cause ___.

Answer 27

– when a speed of 111% NG is exceeded.
– over-temperature and/or over-torque.

Question 28

Engine Torque Limits:

Average torque is displayed on the VSD. Should an engine failure occur, the actual torque of the operating engine will be displayed. When the torque split between two engines is > ___, the value of the maximum TQ line on the INST page will change from ___ to ___.

Answer 28

– 10%
– 100%, 123%

Question 29

Engine Torque Limits:

The display appears in green if TQ is equal to or < ___, changes to red when > ___, dual engine operations, or red at ___, single engine operation. A voice alert “TORQUE” will be triggered when torque is > ___ dual or single engine.

Answer 29

– 100%
– 100%
– 123%
– 95%

Question 30

Torque Limits:

Max. Dual Engine - ___
Max. Single Engine - ___

Answer 30

– 100%
– 123%

Question 31

Fuel Limitations:

NOTE - ___ is not considered “Emergency Fuel.” Emergency fuel shall not be used for more than ___.

Answer 31

– JP8 + 100
– 6 hours cumulative time.

Question 32

Maximum Gross Weight:

The maximum allowable operating gross weight is ___.

Answer 32

50,000 pounds.

Question 33

Cargo Hook Limitations (The limits presented below are structural limitations only):

The structural limit of the forward and aft hook is ___.
The maximum single load that can be suspended as a tandem load from the forward and aft hooks is ___.
The center cargo hook is limited to a maximum load of ___.

When a combination of internal and external loads are carried during the same flight and the external load exceeds ___, position the internal load forward of the ___. This procedure should preclude encountering an excessively aft CG.

Answer 33

– 17,000 pounds each
– 25,000 pounds
– 26,000 pounds
– 12,000 pounds, utility hatch

Question 34

Winch/Rescue Hoist Limitations:

The rescue hoist is limited to a maximum load of ___.
The winch shall not exceed:
– straight line pull ___,
– one pulley ___,
– two pulleys ___,
– three pulleys ___

Answer 34

– 600 pounds
– 3,000 pounds
– 6,000 pounds
– 9,000 pounds
– 12,000 pounds

Question 35

Cruise Guide Indicator (CGI) Limits:

WARNING - Sustained operation in the red or yellow band of the CGI will cause ___ resulting in ___. Any excursion into the red or yellow band for more than ___ requires an entry on the DA Form 2408-13-1.

Answer 35

– damage to the rotor dynamic components (i.e., pitch housing, swash plate assembly, etc.)
– failure of parts, destruction of the aircraft, and injury or death to the crew.
– 45 seconds

Question 36

Cruise Guide Indicator (CGI) Limits:

Care must be exercised during certain maneuvers when level flight airspeeds result in steady CGI indications at the upper end of the green band. Aggressive maneuvers such as ___ will increase aerodynamic loading. Reduction in aerodynamic loading includes one or more of the following: _________

Answer 36

– decelerating turns and break turns

– Lowering the thrust
– Reducing the severity of the maneuver
– Reducing airspeed

Question 37

Airspeed and Gross Weight Limitations With An Operative or Inoperative CGI:

The following limitations apply:
– Maximum crosswind or sideward flight is ___
– Maximum airspeed in rearward flight is ___
– Maximum tailwind for hover is ___
– Maximum airspeed with the lower section of the cabin entrance door open and locked is ___

Answer 37

– 45 knots
– 40 KCAS
– 40 KCAS
– 60 KCAS

Question 38

Airspeed and Gross Weight Limitations With An Operative or Inoperative CGI:

CAUTION - A Dual FADEC primary channel failure may occur when rearward flight or a tailwind exceeds ___. These conditions should be avoided.

NOTE - Aircrew should be alert to the potential for large engine torque oscillations during ___

Answer 38

– 40 KCAS

– rearward flight operations

Question 39

Airspeed and Gross Weight Limitations With An Operative or Inoperative CGI:

The following limitations apply:
– The rescue hatch door shall not be opened or closed above ___
– The windshield wipers shall be off at airspeeds above ___
– Upper section of the cabin entrance - ensure that airspeed is < ___ before closing door in flight
– Left side Escape Hatch: do not ___

Answer 39

– 90 KCAS
– 130 KCAS
– 100 KCAS
– install or remove hatch in forward flight

Question 40

External Cargo Airspeed Limits:

If a sling or hook should fail while carrying a tandem load, limit airspeed to a maximum of ___

Answer 40

60 KCAS

Question 41

Use of Airspeed Operating Limits Charts (Airspeed Limitations Chart):

To determine the maximum operating airspeed, it is necessary to know the ___. Two airspeed limits must be determined and the lower limit used. One is the ___; the other is ___.

Answer 41

– FAT, PA, and GW
– structural limit based on GW
– based on compressibility of airflow over the rotor blade

Question 42

Use of Airspeed Operating Limits Charts (Airspeed Limitations Chart):

At negative density altitude values, the helicopter design Vne is equivalent to ___. At positive density altitude values, the helicopter design Vne is equivalent to ___.

Answer 42

– 170 KCAS
– 170 KTAS

Question 43

Use of Airspeed Operating Limits Charts (Longitudinal Cyclic Trim (LCT) Actuator Airspeed Limits):

Do not manually extend the LCT beyond the GND position on the cyclic trim indicators at calibrated airspeeds below ___. Use of extended cyclic trim at low airspeeds will result in ___.

Answer 43

– 60 KCAS
– high aft rotor blade stresses.

Question 44

Use of Airspeed Operating Limits Charts:

NOTE - Accurate maximum allowable gross weight values for airspeeds ___ can be determined by cross referencing the Maximum Gross Weight For Planned Conditions chart.

Answer 44

0 to 110 KTAS

Question 45

DAFCS Limitations:

The airspeed limit when operating on single DAFCS is ___ or Vne, whichever is slower. The helicopter may be operated with both DAFCS off up to ___ or Vne, whichever is slower, provided both DAFCS are disabled below ___.

Answer 45

– 100 KCAS
– 160 KCAS
– 100 KCAS

Question 46

Aerobatics Prohibition:

Aerobatics are prohibited with this helicopter. Aerobatics are defined as intentional maneuvers beyond ___ and/or ___.

Answer 46

– +/- 30* pitch
– 60* roll

Question 47

Bank Limitations:

The following bank angle limitations apply:
With an operative CGI, bank angles are limited by the CGI, but no greater than ___. When operating with BALT/RALT engaged, limit bank angles to ___ maximum.

With an inoperative CGI, use the bank angle limits defined by Figure 5-12.

Answer 47

– 60*
– 45*

Question 48

Landing Limitations:

– The maximum ground speed for Roll-on-landings is ___
– The maximum nose-up attitude during landings is ___
– The maximum rate of descent at touchdown for gross weights up to ___.
– The maximum rate of descent at touchdown for gross weights from ___
– The maximum rate of descent at touchdown for gross weights above ___

Answer 48

– 60 KGS
– 20*
– 33,000 pounds is 492 ft/min
– 33,000 to 40,000 pounds is 450 ft/min
– 40,000 pounds is 360 ft/min

Question 49

Ground Operation Limitations:

NOTE - The Pilot should make every effort to prevent and minimize ___.

Answer 49

droop stop pounding regardless of actual flight control position.

Question 50

Ground Operation Limitations:

To prevent droop stop pounding when ___, and ___, flight control movements shall not exceed the following from the neutral position: ____________

Answer 50

– all landing gear are in contact with the ground
– the Thrust Contr lever is at ground detent

– Right of left directional pedal - 0.75 inch
– Aft cyclic - 2.00 inches
– Lateral cyclic - 1.00 -inch
– Thrust Contr Lever - No lower than ground detent

Question 51

Ground Operation Limitations:

When ground taxiing < ___ from an obstruction of an unimproved/unfamiliar airfield not designated for CH-47F helicopters, ___.

Answer 51

– 75 feet
– a blade watcher and taxi director shall be positioned as shown in Figure 8-2.

Question 52

Flight Under IMC:

NOTE - Should one DAFCS fail during IMC flight, ___. Should both DAFCS fail during IMC flight, ___.

Answer 52

– the flight may be continued to destination.
– exit IMC as soon as practical.

Question 53

Flight Under IMC:

This helicopter is qualified for IMC flight provided the following conditions exist: ____________

Answer 53

– Both DAFCS are operational.
– Both Standby Flight Displays (SFD) are operating.
– Three MFDs (1, 4, and either 2 or 3), two CDUs, two GPPUs, two DCUs, two EGIs, and two ADCs are operational.
– Coupled ILS approaches at localizer intercept angles of greater than 60* are prohibited.

Question 54

Flight Under IMC:

WARNING - During ILS approaches outside of localizer limits, the FD cue may ___. In the coupled mode, the aircraft ___.

Answer 54

– continue to command a descent with a MISSED APPR annunciator.
– will continue to descend automatically on the glideslope.

Question 55

Shock Absorber Vent Valve:

The shock absorber vent valve must be open for operation below ___. The valve must be closed for operation above ___. Dangerous ground and flight conditions ___. At ___, the valve may be opened or closed.

Answer 55

-18* C
-1* C
– can result if the valve is in the wrong position.
-18* to -1* C

Question 56

Flight in Ice:

CAUTION - During flight in icing conditions with EAPS installed, ___.

Answer 56

the bypass doors must remain closed.

Question 57

Flight in Ice:

Continuous flight in light icing conditions below +5* C ___.

Answer 57

is not recommended since blade damage can occur from asymmetric ice shedding.

Question 58

Flight in Ice:

Intentional flight into known icing conditions with ___ is prohibited. Icing conditions include ___.

Answer 58

– rotor blade erosion protection materials installed
– “trace,” “light,” “moderate,” and “heavy.”

Question 59

Thunderstorm Operations:

To ensure adequate lighting strike protection, ___. If any lightning cables or straps are missing or broken, ___.

Answer 59

– the lighting protection cables and straps must be installed and intact on all rotor blades.
– avoid flight in or near thunderstorms, especially in areas of observed or anticipated lighting discharges.

Question 60

Operation with Skis:

If skis are installed, the following limits apply:
– The maximum allowable airspeed is limited to ___.
– The maximum allowable rate of descent at touchdown in snow is ___, decreasing linearly to ___. For gross weights ___, the rate of descent is ___.
– The maximum taxi speed is ___ when operating on hard prepared surfaces.

Answer 60

– 130 KCAS or Vne, whichever is slower.
– 480 ft/min at gross weights up to 33,000 pounds
– 240 ft/min at 46,000 pounds gross weight
– 46,000 to 50,000 pounds / 240 ft/min
– 5 KNOTS groundspeed

Question 61

Over Water Operation Limitations:

NOTE - The CH47F “Water Landing” mission can no longer be performed ___, therefore the specific paragraph limits and criteria for planning water landings ___.

Answer 61

– without damaging equipment through water intrusion/impact
– have been removed from this manual

Question 62

Over Water Operation Limitations:

The following conditions and limits must be met in order to conduct water operations. Day/ Night/ NVG operations over water is permissible provided: ____________

Answer 62

– Both DAFCS are operational.
– Pilot and copilot radar altimeter is operational.
– A visible horizon is present at the operation site.
– Helicopter drain plugs are installed.

Question 63

Over Water Operation Limitations:

In the event an emergency water landing cannot be avoided, attempt to follow the guidelines listed: __________________

Answer 63

– Restricted to 30 minutes total flotation time.
– The ramp, lower rescue door, and lower main cabin door shall be closed during water landing.
– Pitot Heat turned ON.
– Searchlights retracted and OFF.
– DAFCS native modes must be disarmed.
– Longitudinal Cyclic Trim actuators must be manually set to ground position.

Question 64

Additional Helicopter and ERFS Limitations:

The following additional limitations provide for the safe operation of the aircraft:
– Air to Ground Towing - ___
– APU Operation - ___
– Pitot Tube Limitation - ___
– Windshield Heat - ___
– Single Point Refueling - ___

Answer 64

– Air-to-ground towing operations are prohibited.
– APU operation in flight is prohibited except during emergencies.
– The PITOT HEAT switch shall not be on for more than 5 minutes on the ground.
– Windshield heat shall not be used above 24* C.
– The maximum rate for pressure refueling is 300 gal/min at 55 psi.

Question 65

Extended Range Fuel System II (ERFS II / RSERFS):

– The maximum capacity of one ERFS II tank assembly is ___. The usable fuel in one ERFS II tank assembly is ___ when single point pressure refueled.
– The maximum capacity of on RSERFS tank assembly is ___. The usable fuel in one RSERFS tank assembly is ___ when single point pressure refueled.

Answer 65

– 825.5 US gallons when gravity refueled.
– 800 US gallons

– 516 US gallons when gravity refueled.
– 500 US gallons

Question 66

Extended Range Fuel System II (ERFS II / RSERFS):

CAUTION - Trying to pressure refuel the tanks without connecting the vent lines could ___.
– The maximum internal pressure of the ERFS II / RSERFS tank should not exceed ___.

Answer 66

– over-pressurize the tanks
– 5 psi

Question 67

Extended Range Fuel System II (ERFS II / RSERFS):

CAUTION - Conducting suction defueling at pressures > ___ could damage the internal components of the ERFS II / RSERFS tank assembly.
– The maximum allowable suction during defueling pressure is ___.

Answer 67

-11 psi.
-11 psi.