BBD-700 Power Plant

Question 1

What engines are installed on the Global Express?

Answer 1

BR700-710A2-20

Question 2

What is max ITT for ground / air start?

Answer 2

700° C (Gnd.)

850° C (Air)

Question 3

What are the engine idle limitations?

Answer 3

Max ITT – 860° C

Min N2 - 58.0%

Question 4

What are the engine takeoff thrust limitations?

Answer 4

Max ITT - 900° C
N2 – 99.6%
N1 – 102.0%
5 minutes 2 engines, 10 minutes SE

Question 5

What are the engine max continuous operating limitations?

Answer 5

Max ITT - 860° C
N2 – 98.9%
N1 – 102.0%

Question 6

What is maximum reverse thrust?

Answer 6

70% N1 (EEC controlled) for 30 seconds

Question 7

What is static ground operation limit?

Answer 7

Steady operation between 66% to 80% prohibited

Question 8

Do not engage starter if RPM exceeds?

Answer 8

N2 - 42%

Question 9

What are the start duty cycles?

Answer 9

3 min. on, 15 sec. off
3 min. on, 15 sec. off
3 min. on, 15 min. off

Question 10

What is the minimum oil temperature for engine start?

Answer 10

• 40° C

Must be dry cranked until - 30° C before starting

Question 11

What is the minimum oil temperature before bringing the engine above idle?

Answer 11

+ 20° C

Question 12

What is Max. oil temperature?

Answer 12

+ 160° C

Question 13

What is maximum oil consumption?

Answer 13

.21 US quarts/hour

Question 14

When is oil replenishment prohibited?

Answer 14

OAT at or below -12° C

Question 15

The autothrottle must be engaged and verified by what KIAS?

Answer 15

60 KIAS

Question 16

Use of autothrottle when landing is restricted to what flap setting?

Answer 16

Flaps 30° only

Question 17

Name three thrust reverser limitations

Answer 17

Must not be selected in flight.
Must not be used for touch and go’s.
May not back up the airplane.

Question 18

Engine shutdown required for what minimum oil pressure?

Answer 18

25 PSI

Question 19

How much thrust do the engines on the global express supply at SL?

Answer 19

14,750 lbs @ SL ISA to +20° C

Question 20

Where is bleed air extracted from the engines?

Answer 20

5th or 8th stage of compression

Question 21

Bleed air extraction is used for:

Answer 21

Air conditioning
Pressurization
Cowl and wing anti-ice
Engine starts

Question 22

How is thrust management controlled throughout all phases of flight?

Answer 22

Full authority engine control (FADEC)

An electronic engine controller (EEC) is a major component of the FADEC

Question 23

Describe the 2 main engine rotating assemblies

Answer 23

Single-stage LP fan driven by a two-stage turbine

Ten-stage HP compressor driven by a two-stage turbine

Question 24

How is the engine protected from overspeed?

Answer 24

By closing the fuel high pressure SOV when the EEC recognizes N1 or N2 overspeed value

Question 25

How is the FADEC normally powered during engine operation?

Answer 25

Via the dedicated generator on the accessory gearbox

Question 26

How is interturbine temperature (ITT) measured?

Answer 26

Seven dual element thermocouples located in the LP turbine entry area

Question 27

Where are the N1 and N2 RPM speed sensors located?

Answer 27

N1 – near the LP compressor shaft

N2- front of the accessory gear box

Question 28

How is engine oil cooled?

Answer 28

Fuel cooled oil cooler

Note: Also used to warm low temperature fuel prior to the FMU

Question 29

What is total engine oil quantity?

Answer 29

12.8 US quarts max

Typically fill to 11.0 US quarts via oil replenishment system

Question 30

What is the capacity of the oil replenishment tank?

Answer 30

6 quarts

Question 31

Selecting the ENG RUN switch to OFF closes which fuel shutoff valve?

Answer 31

High-pressure shutoff valve within the fuel metering unit

Question 32

When is high idle commanded by the EEC?

Answer 32

Airplane is in the approach configuration

Question 33

How is EPR calculated?

Answer 33

Ratio of engine inlet total pressure (TAT probe) and

Engine exhaust total pressure

Question 34

When should “Rotorbow” dry cranking be expected during automatic starts?

Answer 34

Between 20 minutes and 5 hours of previous engine shutdown

Question 35

What are the two auto start – air envelopes and associated airspeeds?

Answer 35

ATS ENVELOPE (≤ 249 knots)
WINDWMILL ENVELOPE (≥ 250 knots)

Question 36

When will the automatic ground engine start abort?

Answer 36

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)

Question 37

How are the thrust reversers controlled and actuated?

Answer 37

Controlled by the EEC

Actuated by the respective engine hydraulic system 1A or 2A

Question 38

What will occur if a thrust reverser becomes unlocked?

Answer 38

EICAS message
Aural warning
Thrust retarded to idle (regardless of thrust lever position)
Red REV icon if the door is open

Question 39

What are the ground external air pressure requirements for start?

Answer 39

40 psi desired

Question 40

For airplane operations in excess of 3 hours, the oil system must be verified?

Answer 40

Full before flight

Greater than 10.62 US quarts

Question 41

When must oil replenishment be conducted?

Answer 41

From 5 to 30 minutes after shutdown

15 minutes after shutdown (APU)

Question 42

How long should the engine stabilize in idle before selecting the ENG RUN switch OFF on the shutdown checklist?

Answer 42

3 minutes

Question 43

What is the max engine relight altitude?

Answer 43

30,000 feet