Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
20 Cards in this Set
- Front
- Back
|
Packs |
- processes bleed air to provide temp controlled air L pack - air directly to flight deck - excess to mix manifold - normally from No 1 engine R pack - enters mix manifold, then distributed to cabin (through sidewall risers) - normally from No2 engine |
|
|
Single pack |
In high flow will maintain press & temp throughout operating envelop If switch in AUTO, will revert to high flow during single pack ops - Inc ventilation |
|
|
APU bleed can supply |
- 2 packs on ground - 1 pack in flight |
|
|
Single Engine bleed source can supply |
- 2 packs in flight
On gnd: - 1 eng must not be used to op 2 packs |
|
|
Single Engine bleed source can supply |
- 2 packs in flight
On gnd: - 1 eng must not be used to op 2 packs |
|
|
ZONE TEMP (overhead) |
CONT CAB = - duct temp overheat OR - failure of FD prim and stby temp control
FWD/AFT CAB = duct temp overheat *fwd or aft cabin temp control failure - temp selectors op normally but temp will be averaged btwn both zones |
|
|
TRIM AIR switch |
- opens/closes PRSOV - allows for diff temp settings in ea zone |
|
|
L/R RECIRC FAN switches |
- reduce air con pack load and bleed demand AUTO - if either pack in HIGH, L fan doesn't op - if both packs HIGH, R fan doesn't op |
|
|
PACK (overhead) |
- pack OFF or failure - incorrect config after TO *if both PACK lights illum, both pack valves may be closed - result in gradual loss of cabin press
Pack failure - overheat detected, valve will close - if both primary & standby pack control fail, will continue to op unless overtemp trips off |
|
|
TRIP RESET switch |
- resets fault lights |
|
|
EQUIP COOLING switches |
Cools equip in FD & E&E bay NORM = Normal fan ALTN = alternate fan OFF illum = no flow from selected fan OR pressurization problem EQUIP SMOKE + MC (overhead) = smoke detect in EQUIP cooling system |
|
|
Integrated air system controller (IASC) |
controls bleed air electrically - both primary and backup temp control for flight deck and for fwd & aft cabin
If all temp selectors OFF - IASC causes L pack 24C - IASC cause R pack 18C |
|
|
Pressurization mode selector |
AUTO - pressurization alternates btwn 2 pressure controllers automatically ea flight ALTN MAN - MANUAL (green light) - manual control outflow valve using open/closed switch - use placard to determine cab alt target *outflow valve auto controlled in AUTO & ALTN |
|
|
Outflow valve pwrd |
DC motors ensure continued operation in event of AC failure
- separate DC motor in MAN mode, slower RoC (20 secs for valve to move full range) |
|
|
AUTO FAIL (amber) 6 |
1. Failure of a single press controller = AUTO FAIL + ALTN (green) - press control should auto transfer to 2nd controller 2. Loss of DC pwr 3. Outflow valve control fault 4. Excessive diff press (>8.75) 5. Excessive RoC 6. High cabin alt (ab 15,800) |
|
|
OFF SCHED DESCENT (amber) |
- a/c descend prior to reaching preset cruise alt - auto capability lost if either flight or land alt changed - if not landing at dept a/d, reset flight alt indicator to actual a/c alt |
|
|
Cabin alt exceeds 10,000' |
- intermittent warning horn - can be silenced ALT HORN CUTOUT. switch (next to press gauge) - Don masks |
|
|
Max diff pressure |
9.1 psi Over/under pressurization protection provided by press relief valves |
|
|
Cabin air outflow controlled by |
- outflow valve - overboard exhaust valve
OEV - low diff pressure - valve open and warm E&E air discharged - high diff pressure - valve closed, exhaust air diffused to lining of fwd cargo compartment
*conditioned cabin air exits through foot grills, routed to provide heating for aft cargo compartment then exhausted through outflow valve |
|
|
Packs in HIGH limitation |
Not for TO, approach or landing with 1 or both engine bleed air switches ON |
