B777 GE90 Numbers

Question 1

GE90 Weights ?

Answer 1

GE90 90B/94B : 7892 kgs

GE90 110B1/115B : 8761 kgs

Question 2

GE90 Take-Off Static Thrust ?

Answer 2

GE90-90B : 94000 lbf
GE90-94B : 97300 lbf
GE90-110B1 : 110760 lbf
GE90-115B : 115540 lbf

(Note : Flat rated at 30C/86F)

Question 3

GE90-90B/94B Maximum Indicated EGTs ?

Answer 3

Maximum Take-Off : 1030C
Maximum Continuous : 1015C
Maximum Starting in Flight : 825C
Maximum Starting on Ground : 750C (40”max 825*C)

Question 4

GE90-110B1/115B Maximum Indicated EGTs ?

Answer 4

Maximum Take-Off : 1090C (30”max 1095C)
Maximum Continuous : 1050C
Maximum Starting in Flight : 825C
Maximum Starting on Ground : 750*C

Question 5

GE90-90B/94B Maximum Oil Temperature ?

Answer 5

Continuous Operation : 124*C

Transient (15 minutes max) : 135*C (–>+11)

Question 6

GE90-110B1/115B Maximum Oil Temperature ?

Answer 6

Continuous Operation : 132*C

Transient (15 minutes max) : 143*C (–>+11)

Question 7

GE90-90B/94B Maximum RPM (Red Lines) ?

Answer 7

N1 : 109.0 %

N2 : 117.0 %

Question 8

GE90-110B1/115B Maximum RPM (Red Lines) ?

Answer 8

N1 : 110.5 %

N2 : 121.0 %

Question 9

Low Oil Pressure Limit ?

Answer 9

10 PSI (69 KPA)

Question 10

Starter Duty Cycle (Manual Start) ?

Answer 10

2 cycles as follows :

5 minutes maximum ON then,
10 minutes OFF then,
5 minutes maximum ON.

Note : Let the starter cool for a minimum of 10 minutes before subsequent operation.

Question 11

Minimum Oil Temperature ?

Answer 11

-40*C

Question 12

Maximum Starter Reengagement Limit ?

Answer 12

30% N2

Question 13

GE90-90B/94B FAN/LPC/HPC/HPT/LPT Stages ?

Answer 13

1/3/10/2/6

Question 14

GE90-110B1/115B FAN/LPC/HPC/HPT/LPT Stages ?

Answer 14

1/4/9/2/6

Question 15

Bleed Pick Up Stages ?

Answer 15

GE90-90B/94B : HPC 4&10

GE90-110B1/115B : HPC 4&9

Question 16

Max Oil Consumption ?

Answer 16

GE90-90B/94B : 0.87 Qt/H

GE90-110B1/115B : 0.66 Qt/H

Question 17

Auto Start Sequence Typical Duration ?

Answer 17

90”

Question 18

Auto Start Sequence Schedule ?

Answer 18

Starter Air VLV Open
22% N2
22% N2+15" IGNITION ON
22% N2+18" FUEL ON
56% IGNITION OFF
64% Starter Air VLV Closes
66% IDLE & SELECTOR TO NORM

Question 19

Auto Start Abort Conditions ?

Answer 19

If there is no OIL PRESSURE indication AFTER the EGT increases, do the ABORTED ENGINE START checklist.

Question 20

Manual Start Abort Conditions ?

Answer 20

5 Conditions !
#There is no oil pressure rise before selecting RUN.
#EGT exceeds limits.
#The EGT does not increase by 20 seconds after the FUEL CONTROL switch is moved to RUN.
#There is no N1 rotation indicated by 50% N2.
#N2 does not reach idle within two minutes after selecting RUN.

Question 21

Manual Start Sequence Schedule ?

Answer 21

Starter Air VLV Open
Verify that the oil pressure increases
When at max motoring (less than 1% increase in N2 for approximately 5 seconds) FUEL CONTROL switch RUN
56% IGNITION OFF
64% Starter Air VLV Closes
66% IDLE & SELECTOR TO NORM

Question 22

Manual Override Engine Start ?

Answer 22

Start the engine using normal engine start procedure, except direct the ground crew to:
#manually open the start valve after positioning START/IGNITION selector to START.
#manually close the start valve at 62% N2.

Question 23

Max motoring ?

Answer 23

Less than 1% increase in N2 for approximately 5 seconds.