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23 Cards in this Set
- Front
- Back
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what sys use bleed air?
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a/c and press
aspirated TAT probe wing and engine anti-ice engine start hyd reservoir press water tank press |
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why get bleed air trip
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overtemp
overpressure |
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what is req when using external air for bleed pressure?
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batt switch on -so that protective circuits are enabled
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how many packs can apu power
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2 on ground
1 airborne |
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pack high flow .
1.when? 2. when inhibited? 3. when high flow w/ APU supplying air? |
1. either pack not operating
2. a/c on ground OR airborne w/ flaps extended 3.always (eng bleed air switches must be off) |
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when do ram air doors go full open?
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on the ground OR
airborne w/ flaps extended |
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if all temp selectors are turned off, what temp do packs produce?
zone temp controllers temp range |
lt pack = 75, rt pack = 65
65-85 |
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if both zone and primary pack controllers fail, what happens?
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standby pack controller will command packs to produce air which will satisfy the avg temp demand of the 2 cabin zones
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trim air switch . what do?
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opens/ closes trim air regulating & shutoff valve which allows hot bleed air to enter the zone supply ducts thru the trim air modulating valves
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fwd/aft cabin "zone temp" light
1. on 2. on following mstr caut recall |
1. overheat
2. failure of temp controller |
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cont cabin "zone temp" light
1. on 2. of following master caution recall |
1. duct overheat or failure of primary & secondary temp controllers
2. either primary or secondary controller failed |
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what happens if turn off one of the 3 temp selector controls?
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trim air mod valve closes and temp is governed by the output of the a/c packs
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recirc fans: when turn off automatically?
1. on ground 2. airborne |
1. lt fan off if both pack switch to high
rt fan stays on even if both pack switches to high 2. lt fan: off if either pack switch in high rt fan: off if both pack switches in high |
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pack light
1. why 2. why if comes on at recall? |
1. overheat or both primary and secondary pack controllers have failed
2. failure of one of the pack controllers |
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APU bleed switch closes when?
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fl200
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LEFT wing body overheat light
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lt engine pylon
left inboard wing leading edge left side of a/c bay keel beem APU duct |
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RIGHT wing body overheat light
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right engine pylon
right inboard wing leading edge right side of a/c bay |
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when does overboard exhaust valve open?
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both packs high flow AND
recirc fans off |
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what powers manual press controller?
how long to go from full open to full closed/ |
battery
20 seconds |
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what brings on AUTOFAIL light?
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1. loss of DC power
2. cabin climb > 2000FPM 3. controller failure 4. high cabin altitude (>15,800') |
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can you use both APU air & external air to power packs?
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yes ... there's a checklist in vol 2
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what happened when get ALTN & AUTO FAIL lights on?
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single controller failure and auto switch to the other controller
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minimum pressure when using external high-pressure for air conditioning
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20 psi
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