09-11-01
ALL ú ú 01 Page 201 ú Sep 20/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
TIPPING OF 757-200 AIRPLANE
THE CHART BELOW SHOWS THE 757 TIPPING LIMITS. THE ABSOLUTE TIPPING LIMIT IS THE MLG CENTERLINE AT B.S. 1111.3. THE GROUND STABILITY MARGIN LINE REPRESENTS THE ABSOLUTE TIPPING LIMIT TO ACCOUNT FOR FACTORS SUCH AS TOWING FORCES, RAMP SLOPE AND WIND. BY ENSURING THAT THE AIRPLANE WEIGHT AND C.G. DURING MAINTENANCE OPERATIONS IS BELOW THIS LINE, A TIPPING SITUATION WILL BE AVOIDED.
757-200
GROUND STABILITY MARGIN
TOWING/SHORT TERM MAINTENANCE AND ENGINE REMOVAL CONDITIONS
1120
AIRPLANE CENTER OF GRAVITY PRIOR TO ONE ENGINE REMOVAL (BODY STATION)
1110
1100
1090
1080
1070
1060
1050
1040
Towing Center of Gravity Limitations with Engine(s) Removed
Figure 201 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. 757-200 ú
09-11-01
ú ú 01 Page 202 ú May 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
TIPPING OF 757-200 AIRPLANE
THE CHART BELOW SHOWS THE 757 TIPPING LIMITS. THE ABSOLUTE TIPPING LIMIT IS THE MLG CENTERLINE AT B.S. 1111.3. THE GROUND STABILITY MARGIN LINE REPRESENTS THE ABSOLUTE TIPPING LIMIT TO ACCOUNT FOR FACTORS SUCH AS TOWING FORCES, RAMP SLOPE AND WIND. BY ENSURING THAT THE AIRPLANE WEIGHT AND C.G. DURING MAINTENANCE OPERATIONS IS BELOW THIS LINE, A TIPPING SITUATION WILL BE AVOIDED.
757-200
GROUND STABILITY MARGIN
TOWING/SHORT TERM MAINTENANCE AND ENGINE REMOVAL CONDITIONS
1120
AIRPLANE CENTER OF GRAVITY PRIOR TO TWO ENGINES REMOVAL (BODY STATION)
1110
1100
1090
1080
1070
1060
1050
1040
AIRPLANE GROSS WEIGHT PRIOR TO TWO ENGINES REMOVAL (THOUSAND POUNDS)
Towing Center of Gravity Limitations with Engine(s) Removed Figure 201 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. 757-200 ú
09-11-01
ú ú 01 Page 203 ú May 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
TOW AIRPLANE WITH LIMITED HYDRAULIC BRAKE PRESSURE - MAINTENANCE PRACTICES
__________________________________________________________________________
1. General_______
A. When electrical power from the APU or the tow vehicle is not available to power the airplane electric pumps, the procedure that follows is recommended.
NOTE: Brakes are usually supplied with power by the right hydraulic
____ system of the airplane. The left hydraulic system is used when the right system has a failure, and it operates automatically. If the left and right hydraulic systems have a failure, a precharged accumulator will let you apply the brakes. But, there is a limit to the times you can apply the brakes.
The reserve brake source system supplies a third source of hydraulic power. This source of hydraulic brake power is available when you push the RESERVE BK AND STRG switch in the flight compartment.
B. When you tow the airplane, do not touch the rudder pedals with your feet. Do not apply the brakes unless there is an emergency, or until the airplane comes to a stop. A light pressure on the top of the rudder pedals will cause a decrease of hydraulic pressure through the bleed hole in each antiskid valve.
NOTE: Full pressure (3000 psig) will only let you apply the brakes
____
approximately 2 to 3 times.
TASK 09-11-03-582-001
2. Tow the Airplane________________
A. References
(1)
09-11-00/201, Towing
(2)
32-00-15/201, Landing Gear Door Locks
B. Procedure
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
09-11-03
ALL ú ú 01 Page 201 ú Sep 20/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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