OVERHEAD LIGHTS PANEL - Which lights are Caution?
All lights advisory except UNSCHED STAB TRIM which is a caution-level light
OVERHEAD LIGHTS PANEL - Top row?
- a. ENTRY DOORS: L1 and R1 on the special freighters. Just L1 on PC2SF.
- b. EMER DOORS: Over-wing exits
- c. CARGO DOORS: only the lower cargo doors.
- d. ACCESS DOORS: Forward Equipment compartment or E/E Compartment.
OVERHEAD LIGHTS PANEL - Next double row of lights all:
- a. probe not being heated in flight or
- b. neither engine running on the ground.
- c. Electric power applied to probe any time engine is running, except TAT probe on ground.
- d. All automatic, no switches.
OVERHEAD LIGHTS PANEL - STAB TRIM light (Advisory msg: STAB TRIM)
- a. 1 of 2 brakes did not release.
- b. Stab trimming / rate
- c. manual trim available
OVERHEAD LIGHTS PANEL - UNSCHED STAB TRIM light (Caution msg: UNSCHED STAB TRIM)
- a. uncommanded/runaway trim
- b. trimming in opposite direction of command
- c. manual trim with A/P on.
- d. Single A/P on, control wheel trim switches activated will disconnect A/P
- e. multiple A/P on, control wheel trim switches deactivated.
OVRHEAD LIGHTS PANEL - SPOILERS light (Advisory msg: SPOILERS)
- a. 1 or more spoiler pairs inoperative or
- b. 1 or more spoiler pairs not in commanded position.
OVERHEAD LIGHTS PANEL - AUTO SPDBRK light (Advisory msg: AUTO SPEEDBRAKE)
- a. Fault detected in auto speedbrake system.
- b. Do NOT arm. Manually extend.
OVERHEAD LIGHTS PANEL - RUDDER RATIO light (Advisory msg: RUDDER RATIO)
- a. System failed
- b. Structural protection provided by depressurization of L hydraulic actuator to make rudder less responsive.
- c. May result in max crosswind 15 kts; no autoland and limit inputs > 160 kts
- d. Illuminates with L hydraulic failure, but still have full rudder authority with no restrictions.
- e. Rudder Ratio Changer: Limits rudder deflection commensurate with airspeed.
OVERHEAD LIGHTS PANEL - ANTISKID light (Advisory msg: ANTISKID)
- a. fault detected in antiskid system.
- b. Autobrakes inop.
OVERHEAD LIGHTS PANEL - AIL LOCK light (Advisory msg: AILERON LOCKOUT)
- a. Aileron lockout actuator not in commanded position.
- b. Outboard ailerons failed to lock out at high airspeeds.
- c. At low airspeeds ailerons failed to unlock.
OVERHEAD LIGHTS PANEL - (P&W engines) MACH PROBES
the engines Mach probe heat has failed
OVERHEAD LIGHTS PANEL - (P&W engines) ENG EEC PROBE
engine EEC probe heat has failed. (EICAS tells whether L/R eng)
OVERHEAD LIGHTS PANEL - Which lights should normally be out?
- all should be out with either engine >50% N2, except: MACH PROBE and EEC PROBE
- All out with BOTH engines running
How long is the main (aircraft) battery capable of powering the Standby Power System?
On Standby Power, what effect will battery depletion have on the gear and flaps? (767)
ADP in center Hydraulic system requires DC power to operate. When ADP quits, there will be no Center Hydraulic system pressure, therefore no way to operate gear and no flaps hydraulically (ADP air supply valve will close when DC power is lost)
Electrical - Abbreviations:
- HBB = Hot Battery Bus msg = Message
- BB = Battery Bus xfer = Transfer
- STBY = Standby
- BAT = Battery
- msg = Message
- IDG = Integrated Drive Generator
- xfer = Transfer
- GHB = Ground Handling Bus
- HMG = Hyd Motor Generator HDG
- BTB = Bus Tie Breaker
- GB = Generator Breaker
STANDBY POWER PANEL - Cold/dark airplane
HBB is continuously powered by ship's battery. (Clock's time ref.)
STANDBY POWER PANEL - BAT switch ON
- connects BB to the HBB.
- The DISCH light illuminates with no APU/EXT
Stby power selector - OFF
- Disconnects standby buses from all power sources.
- Must be pushed in to move from Auto to OFF.
STANDBY POWER PANEL - STBY PWR switch in AUTO
- Powers standby buses from main AC and DC
- connects STBY AC & DC to the BB and HBB. (OFF light extinguishes);
- STBY AC powered from a static inverter when only battery is available.
- DISCH light illuminates when battery is discharging.
- (If EICAS powered - MAIN BAT DISCH msg on EICAS)
How is the BAT Charged?
- BAT charger off Ground Service Bus which is off R AC Main.
- Lose R AC, lose battery charger.
- After establishing electric power, main battery charger powers HBB.
What normally powers BB and STBY busses?
With aircraft powered up, BB and STBY busses powered by L AC & DC
STANDBY POWER PANEL - STBY PWR selected to BAT
- main battery powers STBY AC & DC (Severs all connections to AC, even if APU/EXT on and connected.)
- Verify DISCH light illuminates.
STANDBY POWER PANEL - STBY OFF light
- STBY OFF light illuminates if either STBY AC or STBY DC unpowered.
- a. Confirm STBY AC with Cabin DIFF and ALT pointers at blue OFF index mark.
- b. Confirm STBY DC with STBY ADI.
What does the HDG provide power to?
BB, HBB, L and R AC transfer, Standby AC and DC, Either Cpt or FO flight instrument transfer bus.
- HDG connection left of BAT switch to power:
- 3 STBY DC busses. Also powers
- STBY AC,
- L & R AC
- xfer busses and Captain's Instrument xfer bus for 7 total busses
How can First Officers flight instruments be powered from the HDG?
ALTN on the FLT INSTR BUS PW switch.
What is on the HBB
- RAT manual deployment
- fire extinguishers
- clock time references
- refueling system (ALTN)
- APU fuel valve
- IRS emergency power
- parking brake valve
- L/R spar valves
- ground crew call horn.
What is on the BB?
- RAT auto deployment
- fire detection
- Other items:
- DC fuel pump
- Gear alternate extension
- inboard wheels antiskid
- air/ground logic
- landing gear position indicating 1 & 2
- stab trim ALTN switches (if installed)
- STBY engine indicating
- APU fuel pump
- L/R engine fuel valves
- engine start control
- R reverser, wing and R engine anti-ice, crossfeed valve.
What do you get with DC 4 busses?
- DC 4 busses only
- can still aviate, navigate, communicate and land
- 2 IRU's
- standby flight instruments
- stby engine instruments
- L HF
- whiskey compass
- Capt's RDMI
- with FO set IRS in ALTN Limited by battery life. (30 mins).
- But with HDG running adds 3 AC busses,
- (L & RAC xfer busses & Capt's Fit Instrument xfer bus.) No time limit now. All 7 busses powered directly from HDG - limited by fuel only. Have everything L of gear handle, including flap indicator and L FMC.
What is required for DC Bus Tie to close
. Both AC Bus Tie switches must be in AUTO for DC Bus Tie to auto close.
What is required for respective Instrument XFER bus relays to auto XFER?
L or R AC Bus Tie switch must be in AUTO for respective Instrument xfer bus relays to auto xfer.
DISCH light - service bulletin
- pre service bulletin aircraft:
- Switch to STBY switch to BAT on ground or fully powered in flight, will get a DISCH light ON
- post service bulletin:
- as long as RAC is available, the DISCH light will not illuminate.
When does HDG operate automatically? HMG
- On ETOPS aircraft, an
- HMG operates automatically as a backup source of power should both AC busses fail.
What is the normal source of DC power?
APU Generator Control Switch:
- a. ON - (bar in view) closes generator field relay; Arms APU generator breaker to auto-close.
- b. OFF-(blank) Opens generator breaker and field relay, resets fault detection circuitry.
. External Power Control Switch:
- AVAIL light-good quality power is available. GHB is powered.
- Momentary switch - push to ON:
- i. Closes external power contactor
- ii. Trips APU generator breaker open
- iii. Closes L/R AC Bus Tie Breakers
- iv. Will open L/R IDG breakers if closed
BUS TIE Switches
- a. AUTO - Arms auto AC and DC bus tie circuits and Flight Instrument xfer bus circuits.
- b. OFF (ISLN light ON) - commands bus ties open and resets fault detection circuitry.
- BUS TIE ISLN light (Advisory msg; L, R BUS ISOLATED)
- a. fault has occurred auto opening the BTB, or
- b. the BUS TIE switch is OFF.
- BUS OFF light - AC bus is unpowered.
GEN CONT switch
- a. ON-arms the GB to close automatically when generator power is available.
- b. OFF-opens GB and resets fault detection circuitry.
- c. OFF light - GB is open.
GEN DRIVE DISC switch
- a. Push-disconnects drive from generator. Only maintenance can reconnect.
- b. DRIVE light on - IDG oil press low or oil temp high.
UTILITY BUS switch
- a. ON-connects utility bus to respective main AC bus.
- b. OFF-disconnects utility bus from main AC bus and resets fault detection circuitry
3 reasons Utility bus(es) Load shed:
- a. Down to single generator in flight
- b. Due to an overload (if max KVA approached, is shed to reduce load)
- c. During engine start when APU is supplying both pneumatics and electricity. Both buses shed on the first engine started; only the respective Utility bus sheds for the second engine.
- a. 2 Transformer/Rectifiers (T/R) convert AC to DC.
- b. The single DC BTB is controlled by both AC Bus Tie Switches in AUTO. Either BTB switch in ISLN, will inhibit closure of DC BTB with the loss of a T/R.
- c. DC BTB normally open; closes when:
- i. Power lost to either DC bus.
- ii. Both AC BTB switches are in AUTO.
- d. DC BTB closes to provide power to failed DC bus if T/R fails.
Ground Handling Bus:
- a. Powered any time APU or EXT connected (prefers EXT). No battery charger.
- b. Cannot be powered by the engines.
- c. Powers cargo doors, refueling panel and some lighting.