BBD-700 Power Plant Flashcards
What engines are installed on the Global Express?
BR700-710A2-20
What is max ITT for ground / air start?
700° C (Gnd.)
850° C (Air)
What are the engine idle limitations?
Max ITT – 860° C
Min N2 - 58.0%
What are the engine takeoff thrust limitations?
Max ITT - 900° C
N2 – 99.6%
N1 – 102.0%
5 minutes 2 engines, 10 minutes SE
What are the engine max continuous operating limitations?
Max ITT - 860° C
N2 – 98.9%
N1 – 102.0%
What is maximum reverse thrust?
70% N1 (EEC controlled) for 30 seconds
What is static ground operation limit?
Steady operation between 66% to 80% prohibited
Do not engage starter if RPM exceeds?
N2 - 42%
What are the start duty cycles?
3 min. on, 15 sec. off
3 min. on, 15 sec. off
3 min. on, 15 min. off
What is the minimum oil temperature for engine start?
- 40° C
Must be dry cranked until - 30° C before starting
What is the minimum oil temperature before bringing the engine above idle?
+ 20° C
What is Max. oil temperature?
+ 160° C
What is maximum oil consumption?
.21 US quarts/hour
When is oil replenishment prohibited?
OAT at or below -12° C
The autothrottle must be engaged and verified by what KIAS?
60 KIAS
Use of autothrottle when landing is restricted to what flap setting?
Flaps 30° only
Name three thrust reverser limitations
Must not be selected in flight.
Must not be used for touch and go’s.
May not back up the airplane.
Engine shutdown required for what minimum oil pressure?
25 PSI
How much thrust do the engines on the global express supply at SL?
14,750 lbs @ SL ISA to +20° C
Where is bleed air extracted from the engines?
5th or 8th stage of compression
Bleed air extraction is used for:
Air conditioning
Pressurization
Cowl and wing anti-ice
Engine starts
How is thrust management controlled throughout all phases of flight?
Full authority engine control (FADEC)
An electronic engine controller (EEC) is a major component of the FADEC
Describe the 2 main engine rotating assemblies
Single-stage LP fan driven by a two-stage turbine
Ten-stage HP compressor driven by a two-stage turbine
How is the engine protected from overspeed?
By closing the fuel high pressure SOV when the EEC recognizes N1 or N2 overspeed value
How is the FADEC normally powered during engine operation?
Via the dedicated generator on the accessory gearbox
How is interturbine temperature (ITT) measured?
Seven dual element thermocouples located in the LP turbine entry area
Where are the N1 and N2 RPM speed sensors located?
N1 – near the LP compressor shaft
N2- front of the accessory gear box
How is engine oil cooled?
Fuel cooled oil cooler
Note: Also used to warm low temperature fuel prior to the FMU
What is total engine oil quantity?
12.8 US quarts max
Typically fill to 11.0 US quarts via oil replenishment system
What is the capacity of the oil replenishment tank?
6 quarts
Selecting the ENG RUN switch to OFF closes which fuel shutoff valve?
High-pressure shutoff valve within the fuel metering unit
When is high idle commanded by the EEC?
Airplane is in the approach configuration
How is EPR calculated?
Ratio of engine inlet total pressure (TAT probe) and
Engine exhaust total pressure
When should “Rotorbow” dry cranking be expected during automatic starts?
Between 20 minutes and 5 hours of previous engine shutdown
What are the two auto start – air envelopes and associated airspeeds?
ATS ENVELOPE (≤ 249 knots) WINDWMILL ENVELOPE (≥ 250 knots)
When will the automatic ground engine start abort?
ENG RUN switch to OFF N2 speed not ≥ 15% (120 sec) Idle speed not achieved (120 sec) Starter cutout not reached within starter duty timer (3 min) ITT exceeding start limit (700° C)
How are the thrust reversers controlled and actuated?
Controlled by the EEC
Actuated by the respective engine hydraulic system 1A or 2A
What will occur if a thrust reverser becomes unlocked?
EICAS message
Aural warning
Thrust retarded to idle (regardless of thrust lever position)
Red REV icon if the door is open
What are the ground external air pressure requirements for start?
40 psi desired
For airplane operations in excess of 3 hours, the oil system must be verified?
Full before flight
Greater than 10.62 US quarts
When must oil replenishment be conducted?
From 5 to 30 minutes after shutdown
15 minutes after shutdown (APU)
How long should the engine stabilize in idle before selecting the ENG RUN switch OFF on the shutdown checklist?
3 minutes
What is the max engine relight altitude?
30,000 feet
