Systems Flashcards
What is the Landing gear transfer unit (LGTU) for?
When is it activated?
Uses system B fluid to raise gear when:
- airborne
- landing gear lever UP
- either main gear NOT up
- Eng #1 rpm drops (<50% N2)
When does the PTU operate?
- system B pressure drops and
- airborne and
- flaps <15 but not up
Standby Hydraulic pump automatically activates when:
- FLT CONTROL A or B switches ON
- loss of system A or B pressure, and
- airborne with flaps extended or
- on the ground w/ wheel speed >60kts
or - FFM trips
Rudder Pressure Reducer activated when:
-speed >135kts, hydraulic systems A and B pressure reduced by 25%
Do NOT DISPATCH/TAKEOFF items:
- ELEC light
- ENGINE CONTROL light
- CDS FAULT on PFD (amber)
- PSEU light, depending on how when it comes on
Autopilot disconnect methods:
Manually:
- manual trim activation
- autopilot disconnect switches (on yoke or MCP)
- override force applied to control column
- MCP A/P disconnect bar
- STAB TRIM CUTOUT switches - OFF
Automatically:
- TO/GA pressed in SINGLE CH
- TO/GA pressed after touchdown during dual A/P approach
- IRS fail
- Loss of respective hydraulic system
- loss of electrical power
- 2 sec after VOR LOC capture with RA inop
-Any attempt to override dual A/P
Assumed Temp Method (ATM) and fixed derate:
When allowed?
ATM not allowed when:
- anti-skid inop
- contaminated runways
Can use fixed DR on contaminated runways.
No greater than 25% total reduction from rated TO thrust.
Nose wheel well horn sounds when:
- battery drain condition exists
- E&E bay over temp condition on ground (equipment cooling fan failure)
- GRD CALL button pushed.
PSEU light comes on when:
On ground only:
- fault detected in PSEU or
- main cargo door switch failed giving false door position indication during recall
-Inhibited from thrust lever advance for take off until 30 secs after landing
IRS lights
ALIGN:
ON DC:
FAULT:
DC FAIL:
ALIGN:
steady:
-align mode or shutdown cycle
Flashing:
-alignment can not complete due to:
—aircraft movement
—difference between a/c position and last position
—no present position entered
FAULT:
-fault in related system
ON DC:
- related IRS operating in DC power from Switched Hot Battery bus (AC power not normal)
- (on ground) nose wheel call horn sounds due to battery discharge
- momentarily on during self-test
- R IRS will shut off after 5mins on BAT
DC FAIL:
-dc power for related IRS not normal
REVERSER light:
- TR isolation or control valve not in commanded position
- TR sleeve not in commanded position
- auto-restow activated
- failure of sync shaft lock
ENGINE CONTROL light:
A/C not dispatchable due to faults
Comes on when:
- aircraft on ground and
- engine operating, and
- <80kts before take off, or
- 30secs after landing
Flight recorder test switch:
NORMAL:
In flight
And on ground
In flight:
-operates anytime electrical power
On ground:
- either engine must be running
When fire switch illuminates, what happens?
Fire handle/switch is unlocked
What happens when a fire switch is pulled?
- closes spar and engine fuel sov’s
- closes engine bleed air sov’s
- closes engine driven hydraulic pump SOV and deactivates respective LOW PRESSURE hyd light
- trips generator control relay and breaker
- disables respective thrust reverser
- arms one squib on each bottle
- allows fire switch to be rotated
