B737 Air Systems - TS Flashcards
(74 cards)
0
Q
- Where does the external pneumatic air enter the pneumatic manifold?
A
Right of the Isolation Valve
1
Q
- Where does APU bleed air enter the pneumatic manifold?
A
Left of the Isolation Valve
2
Q
- What are all the sources that provide air for the pneumatic system?
A
External, APU and 5th and 9th stage engine bleeds
3
Q
- An 800 aircraft has three air conditioning control zones. The temperature controllers are in NORMAL and trim air is ON. The two packs will supply air at what temperature?
A
A temperature for the zone requiring the most cooling
4
Q
- What happens when an engine bleed switch is placed to ON?
A
If engine bleed air and electrical power are available, the valve opens
5
Q
- What does an illuminated engine BLEED TRIP OFF light indicate?
A
Excessive engine bleed air pressure or temperature caution, engine bleed valve closes automatically
6
Q
- How is engine bleed air temperature regulated?
A
Controlled engine fan air circulates through a precooler
7
Q
- Air for starting the engines is supplied from ________.
A
The left or right pneumatic manifold
8
Q
- Which statements are correct regarding the pneumatic manifold pressure sensors?
A
AC powered; located in left & right pneumatic manifolds
9
Q
- What do the duct pressure pointers indicate when one pack valve switch is placed to OFF with the APU providing bleed air and the isolation valve in AUTO?
A
APU bleed pressure shows on both pointers
10
Q
- What occurs when the APU bleed air switch is placed to ON?
A
DC power signals valve to open, APU bleed air opens the valve if RPM is above 95%
11
Q
- What is the power source for the pneumatic isolation valve?
A
AC power
12
Q
- Which statement best describes the isolation valve function?
A
Isolates left & right sides of the pneumatic manifold and is closed during normal operation
13
Q
- What action causes the pneumatic isolation valve to open when the switch is in the AUTO position?
A
Placing an engine bleed air switch or pack switch to OFF
14
Q
- What is the function of the DUAL BLEED light?
A
To warn when the APU may be back pressured by engine bleed air
15
Q
- Which valve and switch combination causes the DUAL BLEED light to come on?
A
APU bleed valve OPEN & right engine bleed switch On, with the isolation valve OPEN
16
Q
- What is the crew action for an illuminated DUAL BLEED light prior to engine start?
A
No action Dual Bleed Light is normal during engine start with APU bleed air
17
Q
- Which condition illuminates a WING-BODY OVERHEAT light?
A
All answers are correct: Bleed air leak in the APU bleed air duct, Bleed air leak in the wing leading edge inboard of the engine strut, bleed air leak in the aircraft keel beam area
18
Q
- What engine stages provide bleed air?
A
The 5th and 9th stage
19
Q
- The 9th stage engine bleed air is the primary source of bleed air for pneumatics when the engine is at cruise thrust.
A
FALSE
20
Q
- The engine bleed valves are located:
A
Downstream of the 9th stage modulations/shutoff valve
21
Q
- How are the bleed valves operated?
A
They are electrically controlled and pneumatically operated
22
Q
- Excessive engine bleed air pressure or temperature will cause what condition to occur?
A
A bleed trip
23
Q
- If the APU bleed valve and switch are open, the valve will automatically close with APU shutdown.
A
TRUE
24
27. A right WING-BODY OVERHEAT light could indicate a bleed air leak in all of the following, except:
In the keel beam area
25
29. The potable water system pressurization line connects to which part of the pneumatic manifold?
The left side
26
30. The Engine Bleed Valve Trip pressure sensor is located ________.
Before bleed air reaches the engine bleed valve
27
31. The Engine Bleed Valve Trip temperature sensor is located
After the engine bleed air passes the engine bleed valve and pre-cooler
28
32. What limitation is imposed when the DUAL BLEED light is illuminated?
No more than idle engine power is allowed
29
33. External pneumatic air can be used to start the number 1 engine _______.
If the isolation valve is open
30
34. The APU provides bleed air directly to
The left side of the pneumatic manifold
31
35. The engine bleed valve must be open for ENGINE anti-ice to be available.
FALSE
32
36. What is the normal source of conditioned air for the flight deck with both packs operating?
The left pack prior to the mix manifold
33
37. What is the indication on the respective AIR MIX VALVE position indicator when a pack valve closes? (700)
Full COLD
34
38. Which is correct for pack operation?
Bleed air flows through a heat exchanger, the ACM compressor, a second heat exchanger, then the ACM turbine
35
39. What does an illuminated amber PACK light indicate?
Pack valve closed by compressor discharge or turbine inlet overtemp or duct over temp
36
40. When are the RAM DOOR FULL OPEN lights extinguished?
In cruise with low pack temperature
37
41. On the ground, what is the proper indication of the ram door position lights?
RAM DOOR FULL OPEN lights illuminated
38
43. Which statement is correct regarding the air conditioning system deflector doors?
The doors extend on the ground to prevent FOD ingestion
39
44. What is the purpose of the recirculation fan?
Reduced pack loads & engine bleed demand
40
45. Where is filtered RECIRC FAN air discharged?
Into the mix manifold
41
47. Which statement is correct regarding single pack operation with one pack switch in AUTO and one pack switch OFF inflight?
Remaining pack goes to high flow in flight when flaps are up
42
50. How is hot air removed from the circuit breaker panels and the E & E compartment equipment?
By either the main or alternate equipment cooling fans
43
51. Which statements is correct regarding operation of the flow control valve?
Closes when cabin pressure differential reaches 2.5 psid
44
52. What does an illuminated EQUIP COOLING OFF light indicate?
NO airflow from the respective equipment cooling fan
45
54. Which systems are reset by means of the TRIP RESET switch?
PACK & BLEED TRIP OFF
46
55. How are the pack & isolation valve switches positioned for a BLEEDS-OFF takeoff?
Pack switches AUTO, isolation valve switch CLOSE
47
56. During a bleed ON takeoff, the air conditioning pack switches and the isolation valve switch are positioned:
The right pack in AUTO the isolation valve switch in AUTO, and the left pack in AUTO
48
58. With both packs operating, if air conditioning smoke appears in the cockpit and in the cabin, the most likely source is:
Left air conditioning pack
49
59. With RECIRC fan switch in AUTO, the fan _________. (737-700)
Operates if one pack is turned OFF and the other is in AUTO
50
60. E & E compartment cooling airflow is normally provided by the:
Equipment cooling fan
51
61. Overheat temperature sensors that will cause a pack trip are located in the: (737-500)
ACM compressor discharge duct and turbine inlet duct
52
62. When parked at the gate, external conditioned air temperature ________ controlled by the packs.
IS not
53
63. Bleed air for the pack is ______________ as it passes through the primary heat exchanger.
Cooled
54
64. The selector on the left controls the temperature for.
Flight deck
55
65. With the pack switch turned OFF, the pack valve closes and the mix valves.
Move to full cold
56
67. Which cabin pressure control modes utilize the outflow valve DC motor? (digital controller)
AUTO and ALT
57
69. Which model 737 has a TRIM AIR switch on the overhead panel
800 model
58
72. If the aircraft climbs above the altitude set in the pressurization controller FLT ALT window, the cabin pressure will remain constant until which psid?
8.45 psid
59
73. The B-737-700 has pressure relief valves that limit the cabin differential pressure to what value?
9.1 psid differential
60
77. What does an illuminated OFF SCHED DESCENT light indicate?
Aircraft descending without having reached the selected cruise altitude
61
78. What does an illuminated AUTO FAIL light and ALT light on the pressurization panel indicate?
Primary auto control has failed and automatically switched to ALT mode
62
79. Which condition illuminates the pressurization AUTO FAIL light?
Primary Auto System Failed
63
81. Which statement is correct regarding the outflow valve position indicator?
Operates in all pressurization modes with AC power available
64
84. All of the following items control the ram air system ram door and exhaust louvers except:
The pressurization controller
65
85. What is the maximum differential pressure allowed by the System Safety Pressure Relief Valves?
A differential pressure of 9.1
66
88. When is the RAM DOOR FULL OPEN light illuminated?
On the ground, or in flight with the flaps extended
67
89. Illumination of the amber pressurization OFF SCHED DESCENT light indicates what situation?
The airplane is descending prior to reaching the selected flight altitude
68
90. What is the maximum allowable differential pressure for takeoff?
.125 PSID
69
91. The air conditioning packs may be operated in HIGH during a bleed on takeoff.
FALSE
70
92. With the aircraft the maximum certified altitude and one pack operating, what is the lowest cabin altitude can that be maintained?
8000 feet
71
93. Which of the following rely on pneumatics for operations?
Water tank pressurization
72
95. Which B737 model has a trim air switch on the overhead panel?
B737-800
73
100. After turning on the APU bleed air, what pressure is seen on the L and R indicator with the Left Pack off and the isolation valve in auto?
Both pointers indicate pressure (L and R)
