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757 MAINTENANCE MANUAL
(k)
If the talcum powder starts to change color at the edge of the area where you applied it, apply more talcum powder at that edge.
(l)
Make a mark that you can see easily at the location of all external leaks.
S 286-003
(2) If you find the external leak in a location that has aerodynamic smoother, remove some aerodynamic smoother around the area of the leak (AMM 51-31-01/201).
NOTE: It is a good procedure if the hole in the smoother is
____ approximately the same as the dimensions of the nozzle that you use for the backblowing procedure.
S 286-004
(3)
Do not defuel the fuel tanks until you know the exact location of all leaks on the airplane skin.
G.
Use the Backblowing Procedure to Find the Internal Leaks
S 656-005
(1) Defuel the applicable fuel tank(s) (AMM 28-26-00/201).
S 016-006
WARNING: CAREFULLY DO ALL OF THE SAFETY PROCEDURES IN THE PURGING AND
_______ ENTRY PROCEDURE FOR THE FUEL TANK. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
(2)
Do this Task: Fuel Tank Purging and Entry, for the tank that has the leak (AMM 28-11-00/201).
S 946-007
(3)
Two persons are necessary to do this task:
(a)
One person must be out of the tank at the external location of the leak.
(b)
One person must go into the tank and find the internal location of the leak.
(c)
If the leak external leak location is near the tank end rib, the leak can be in the center tank or the wing tank.
NOTE: It is a faster procedure to put a person in the
____ center tank and in the wing tank at the same time to look for the internal leak.
S 946-008
(4) The two persons must agree on a procedure to communicate.
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28-11-00
ALL ú ú 01 Page 609 ú May 28/99
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MAINTENANCE MANUAL
S 286-009
(5) One person must go into the tank to a location near the external leak location.
NOTE: The person out of the tank can knock on the airplane skin
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