FCOM Flashcards
How does the SRS work? (Both the 1 & 2 Engine Cases)
SRS – will engage if: V2 entered Go Around
Slats extended
a/c been on ground for > 30secs
SRS maintains V2 + 10kts
If OEI maintains highest of V2 or current speed (max V2 + 15kts)
SRS limits pitch to +18o or +22.5oif windshear
Go-around case: Maintains current speed or Vapp whichever is higher.
Limited to; VLS+25kts, or in OEI case VLS+15kts
Must have flap lever set to min Config 1 and TOGA selected on at least one thrust lever.
What powers the AC ESS BUS?
AC BUS1 or AC BUS2 via the ESS FEED PB (lights up white ALTN if AC BUS 2 powering), most of the fleet now have auto switching
When does the PTU operate?
Difference greater than 500 psi between systems
TA/RA what are recommendations from Airbus?
Max rate ±1500fpm within 2000ft of cleared level
What does REC MAX on the PROG page mean?
The aircraft can reach this Level and: o Maintain a 0.3g buffet margin o Fly level at MAX CRZ rating o Maintain +300fpm v/s at MAX CLB thrust o Maintain speed >green dot and
What does OPT ALT mean on FMGC PROG page?
OPT FL indicates the optimum flight level based on:
o Current GW
o cost index
o Temperature
o Wind
It is continuously updated in flight. It requires a 15-minute minimum cruise time.
The OPT FL is a compromise between fuel and time saving.
QRH/FCOM tables are for a given Mach & do not consider CI, hence differ from FMGC.
Circling approach - When must you disconnect the autopilot?
Airbus limitation: 500’ AGL
EJ SOP: Immediately after the start of the level base turn.
Where must the Thrust Levers be before the Auto Brake Max activates?
In the case of an aborted takeoff, maximum pressure goes to the brakes, as soon as the system generates the ground spoiler deployment order.
- If the ground spoilers are armed and the speed exceeds 72 knots, the ground spoilers will automatically extend as soon as both thrust levers are reset to idle
- If the ground spoilers are not armed and the speed exceeds 72 knots, the ground spoilers will automatically extend as soon as reverse is selected on one engine (the other thrust lever remains at idle).
So if RTO <72kts = no spoiler extension = no auto brake
Above what speed will Auto Brake Max function during a rejected Take-off?
72kts
At what crosswind do you put stick Full Forward during take-off?
20kts
What speed is connection between nose wheel steering & the rudder pedals removed?
130kts, (NWS input ±6°, reduces after 40kts down to 0° at 130kts)
Tiller input stops at 70kts (±75° reduces after 20kts down to 0° at 70kts)
Above what height can you put the Auto Pilot in?
100’ (with SRS mode)
N.B. FMGC logic prevents A/P engagement during first 5 seconds after liftoff
What hydraulic system runs the normal brakes?
Green
Do we have a system to manually select alternate brakes (trick question)
No, it is done automatically as required when GREEN HYD pressure is insufficient
Is anti-skid available on the alternate brakes?
Yes (BSCU can still control anti-skid with alternate brakes)
Name the 4 different levels of braking depending of failures?
- Normal Braking
- Alternate Braking with anti-skid.
- Alternate Braking without anti-skid
- Parking brake
How is anti-skid deactivated?
o Electrically: The Anti-skid/NWS switch OFF, power supply failure or BSCU failure. Or
o Hydraulically: Failure of Green and Yellow Hydraulic systems.
Is auto-brake available on the alternate brake system?
No
Difference between OPEN CLB and CLB?
OPEN CLB: Ignores Altitude Constraints up to FCU selected Altitude.
CLB:Respects the Altitude Constraints up to the FCU selected Altitude.
Both control speed via AP/FD Pitch control & A/THR maintains Max Climb Thrust in both cases
CLB/ALT* then new FL given, what happens?
Mode reversion. Engages V/S at the current Vertical Speed.
What are the potential problems with the V/S mode?
The V/S (FPA) guidance has priority over speed guidance.
Excessive V/S in CLB – Speed may fall to VLS
Excessive V/S in DES – Speed may increase to Vmax
When speed reaches its authorised limit, V/S automatically decreases to maintain the min/max speed.
Autoland red light: conditions for illumination?
- Both A/P’s fail
- LOC fails above 15ft
- G/S fails above 100ft
- Deviation. LOC (1/4 dot above 15’) or G/S (1 dot above 100’) also LOC & G/S scales flash on PFD
- Difference between Rad Alts > 15ft
Can you re-engage a CB in flight that has tripped off by itself?
Do not re-engage in flight if CB tripped by itself, unless the Captain judges it necessary to be so for the safe continuation of the flight. Only as a last resort and only one re-engagement should be attempted.
On the ground do not re-engage the C/B on any fuel pump.
If you have a RA 1 + 2 failure, can you intercept the Localiser and Glide slope?
- LOC Mode only available (ILS APPR mode cannot be engaged.)
Fly manually to cat 1 minima or LOC/DME procedure may be used to relevant minima.
Will the Ignition come on automatically when the engine anti-ice is put on?
No
What does FMS/GPS POS DISAGREE mean?
ECAM displayed when the FMS and GPS positions differ by more than:
-A latitude threshold of 0.5 min, regardless of latitude
-A longitude threshold that depends on the latitude:
• 0.5 min between 55⁰ N and 55⁰ S
• 0.9 min between 55⁰ and 70⁰
Describe the A320 ‘High Speed Protection’ system.
- Activated at or above Vmo/Mmo
- Sidestick nose down authority reduced
- Permanent nose-up order is applied
- Spiral static stability is reduced to 0⁰ bank angle (instead of 33⁰)
- Bank angle limit reduced to 40⁰ (instead of 67⁰)
What are the GPWS inputs?
- RA1
- ADIRS1
- ILS1
- FMGC1
- FCU1+2
- LGCIU1
- SGCC1
What are the GPWS warning Modes & when are they active?
Generates aural & visual warnings between Rad Alts 30 feet and 2,540 feet.
• Mode 1:Excessive rate of Descent
• Mode 2:Excessive Terrain Closure Rate
• Mode 3:Altitude Loss after takeoff or go-around.
• Mode 4:Unsafe Terrain Clearance when not in Landing Configuration.
• Mode 5:Too far below glideslope.
How many Slat and Flap surfaces are there?
5 Slat surfaces
2 Flap surfaces
How many SFCCs are there and how are they configured?
2 SFCCs
Each has 1 flap and 1 slat channel
Describe the PCU that operates slats and flaps
The Power Control Unit consists of 2 independent hydraulic motors coupled by a differential gear box
Slats use GREEN and BLUE hydraulics
Flaps use GREEN and YELLOW hydraulics
What is the function of Pressure Off Brakes(POBs)?
POBs lock the transmission when surfaces in position or hydraulics fail
What do Assymetry Position Pick-off Units (APPUs) do?
APPUs measure asymmetry between left & right wings
When are Wing Tip Brakes (WTBs) activated and which hydraulic systems power them?
WTBs are activated in case of asymmetry, mechanism over-speed and symmetrical runaway or uncommanded movement.
WTBs cannot be released in flight.
Right Wing -> BLUE & GREEN, Slats and Flaps
Left Wing -> BLUE & YELLOW, Slats and Flaps
Can Flaps be operated if the Slats WTB is activated?
Yes. And vice versa.
