-
When you fuel
-
When you defuel
-
When the fuel tanks are open.
(6)
You can use heat guns, soldering guns, and soldering irons when and where smoking is permitted. If you use these devices where smoking is not permitted, you must first make sure there are not dangerous levels of fuel vapors in the work area.
(7)
Zero is the safe fuel vapor level at which to use devices that can cause ignition.
(8)
Measure the fuel vapor level with a combustible gas indicator that reads in "PRECENT LOWER EXPLOSIVE LIMIT" or "PRECENT EXPLOSIVE". For example, you can use Mine Safety Appliances, Model 2 or Davis, Model D-16. If you can read a fuel fume level on this equipment, two conditions have occurred:
-A liquid fuel or fume source is near
-The local fuel fume levels are high or the ventilation is not
sufficient. Use the equipment to measure the initial fuel fume levels. Make sure the fuel fume levels are sufficiently low. Continue to monitor the fuel fume levels during the repair.
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757
MAINTENANCE MANUAL
(9)
Do not use a possible ignition source near open fuel tanks, fuel vents, or fuel leaks where fume concentrations cannot be known or controlled.
(10)
If you use a possible ignition source near an airplane where smoking is not permitted, make sure a person monitors the work and any other work in the area. The person must be authorized to monitor airplane fire safety.
(11)
A person who can measure the risk of the repair to be done must identify the emergency or fire fighting equipment necessary at the work area of the repair. The person must be authorized to monitor airplane fire safety.
(12)
Do not start or continue to do work on a fuel system component while equipment that can cause the fuel to burn is near.
(13)
Keep the number of maintenance and safety persons included to a minimum.
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757 MAINTENANCE MANUAL
FLIGHT CONTROL SURFACES SAFETY HARNESS RECEPTACLE - MAINTENANCE PRACTICES
_________________________________________________________________________
1. General_______
A. This procedure contains one task. The task is to attach the safety harness to the flight control surfaces.
B. Receptacles for the safety harness are on the top surfaces of the wing and horizontal stabilizer. Maintenance persons who work high above the ground will attach their safety harnesses to these receptacles.
TASK 20-10-27-402-001
2. Attach the Safety Harness (Fig._________________________201)
A. General
(1)
There are four receptacles on the wing top surface and two receptacles on the horizontal stabilizer top surface.
(2)
The safety harness attach lanyard uses a lock assembly.
B. Equipment
(1) Attach Lanyard - Wing/Horizontal Stabilizer
Safety Harness, B20001-5
C. Procedure
S 822-002
(1)
Adjust the lock assembly until it is aligned with the airplane skin. If not aligned, there is a risk the lock assembly will not engage correctly.
(2)
Attach the safety harness attach lanyard to the receptacle.
(3)
Attach the safety harness to the safely harness attach lanyard.
S 492-003
S 492-004
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