Week 3 Part 2 Flashcards
What engine is used on the G650?
BR725
How many compressor stages does the BR725 have?
10
How many turbine stages does the BR725 have?
- 2 stage HP
- 3 stage LP
What is P0 air?
Ambient from around EEC in the cowling
Hi do you latch and unlatch cowls?
- Latch in to our
- unlatch out to in
Above what wind speed should you not open cowls?
13 knots or 15 mph
I’m EEC harnesses, what channel is what colour?
- A - yellow
- B - green
The fuel drains tank can take fuel from how many normal starts, and how many aborted starts?
- 3 normal starts
- 2 aborted
When is rotor bow an issue?
20 mins to 5 hours after engine shutdown
What does the EEC do to negate rotor bow if the engine is started 20 mins - 5 hours after it was last operated?
- engine start protect CAS
- engine cranks the engine for longer for cooling prior to ignition
The EEC data entry plug stays with the ________
Aircraft
The EEC is powered by the ___ bus until N2 is __% when the PMA takes over
- ESS
- 35%
Standby engine information/control on the MCDU’s gets signal straight from where?
Channel A of each EEC
How many N1 speed probes are there per engine?
- 3
- one for channels A and B
- one spare as not LRU
Are the N2 probes LRU’s?
Yes
If the APU door failed to close, what might be the issue?
APU door actuator failed
What must the APU be prior to working on it?
- shut down
- cooled
How many cowl latches need to be closed for an engine run?
All 5
Engine TGT must be below ___ degrees for a normal start. ___ motor the engine to cool it of over this limit
- 150
- dry
What does green IGN mean on engine start page?
Ignition system is active
When using master crank (alternate engine start), what do we lose?
Protections
Engine starter limitation is what?
- 3 x 3 minute attempts and then wait 15 mins
What component controls the buffer air valves?
Mechanical linkage from the VSV actuator, which is controlled by the EHSV in the FMU
What component controls VSV position?
The VSV actuator, which is controlled by the EHSV in the FMU
What do VSV’s prevent?
Compressor surge during rapid throttle movements
What is soft reversion?
N1 control when the EEC loses a parameter to calculate EPR (AMBER CAS)
What is hard reversion?
N1 control hard selected on the SMC (BLUE CAS)
How many engine TGT thermocouples are there?
7
What are the engine hot red CAS messages? (3)
- Turbine oil fire (550 deg)
- hydraulic fluid (135 deg)
- FADEC hot (150 deg)
Is EVM part of the FADEC system?
No
Minimum oil pressure during engine runs is what?
25psi
Minimum oil temp for engine start is what?
-40 deg
Once you’ve operated the piggy back levers for TR deployment, how long do you have to operate the maintenance test enable switch?
30 seconds
On the TR lockout bolts, what must you inspect
Bolt o rings
Engine oils can be serviced when?
5 mins to 24 hours after runs
Engine oil filter bypasses at __psid and indicates impending bypass at __psid
- 50
- 28
In alternate mode, the engine EEC does not limit ___ on ground
TGT
When installing a new igniter and you’ve lost the old washer, what must you carry out?
Immersion depth
When do you get an oil filter CAS message?
Impending bypass (28psi)
What bus to the igniters use?
- Essential DC
- 28V DC in
- 3000V out
What do the buffer air valves do?
- Allow HP4 air to the bearings
- controlled via VSV actuator
What ports fuel from the FMU to VSV actuator?
EHSV in the FMU
How do you reset the oil filter DPI?
Remove filter and filter cover and turn upside down
With the starter air valve replacement, what do you need to ensure?
V band clamps 90 degrees offset
