S 216-036
(5)
Visually examine all the couplings for external indications of these types of damage and make sure the damage is within permitted limits:
(a)
Do an inspection for cracks.
1) No cracks are permitted.
(b)
Do an inspection for scratches.
1) The scratches in the couplings must not have a depth of more than 0.004 inch.
(c)
Do an inspection for nicks. 1) The nicks in the couplings must have rounded bottoms. 2) The nicks in the couplings must not have a depth of more
than 0.004 inch. 3) You must remove all the burrs around the nick.
(d)
Do an inspection for worn areas (galling). 1) No worn areas in the surfaces that have an O-ring seal are permitted.
2) No worn areas in the surfaces that have an O-ring seal are permitted.
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MAINTENANCE MANUAL
S 356-037
(6) Repair or replace all the couplings which have damage that is beyond permitted limits (AMM 28-22-07/401).
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BOOST PUMP REMOVAL CHECK VALVE - REMOVAL/INSTALLATION
_____________________________________________________
1. General_______
A. A removal check valve attaches to each of the four fuel boost pumps and two fuel override pumps. The fuel boost pumps and fuel override pumps are installed on the front and rear spars. The removal check valve lets you remove the motor impeller without defueling the fuel tank.
B. This procedure contains two tasks. The first task removes the removal check valve. The second task installs the removal check valve.
TASK 28-22-08-004-001
2. Remove the Removal Check Valve (Fig. 401)______________________________
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