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THRUST REVERSER - MAINTENANCE PRACTICES
1. General
A. This procedure provides a method of manually locking the thrust reverser in the forward thrust position. This procedure is to be used for dispatch of an airplane with an inoperable thrust reverser.
2. Equipment and Materials
A. Thrust Reverser Isolation Valve Ground Lock Cap and Pin Assembly - F80109-3 or
F80109-9 (preferred)
B. 3-foot lever (crowbar, prybar, steel tube etc.)
C. Protective tape
3. Manually Deactivate Thrust Reverser
A. Deactivate the affected thrust reverser hydraulic system by installing a ground lock cap and pin in the applicable thrust reverser isolation valve.
WARNING: SERIOUS INJURY CAN RESULT TO PERSONNEL IF GROUND LOCK CAP AND PIN IS NOT PROPERLY INSTALLED. ATTEMPT TO STOW THRUST REVERSER AFTER INSTALLING GROUND LOCK CAP AND PIN. REVERSER SHOULD NOT STOW.
B. Pull and tag the affected THRUST REVERSER circuit breaker on panel P6.
C. Remove screws attaching actuator housing fairings to thrust reverser and remove both fairings (if necessary) (Fig. 201).
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H27539 A86833 G42820
Thrust Reverser Manual Deactivation 500
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500 Thrust Reverser Overcenter Linkage
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Deactivate Thrust Reverser Isolation Valve 500
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D. If malfunction requiring deactivation is attributed to hydraulic system, proceed as follows:
(1)
Apply protective tape to end of lever.
NOTE: Protective tape is used to prevent damage to thrust reverser guide carriage and shroud assembly box.
(2)
Manually move deflector doors as close to the stowed position as possible.
(3)
Position tip of lever under either lug of guide carriage and using the shroud assembly box as a fulcrum, pry guide carriage aft until an over center position is reached.
CAUTION: WHEN PRYING GUIDE CARRIAGE AFT, USE CARE TO PREVENT SCRATCHING ACTUATOR HARDWARE.
E. Repeat step D on opposite side.
F. Attach actuator-housing fairings (if removed) to thrust reverser with screws.
NOTE: Due to deflector door preload it is necessary to pry edges of doors open to slide actuator-housing fairings into place.
G. If malfunction requiring deactivation is attributed to a jammed deflector door actuator, proceed as follows:
(1)
Manually move deflector doors as close to the stowed position as possible.
(2)
Remove bolt, washers and nut securing actuator rod to guide carriage.
(3)
Firmly secure actuator to shroud assembly box with lockwire or suitable equivalent.
(4)
Pry guide carriage over center per steps D. (1) and (3).
H. Repeat step G. on opposite side.
I. For all malfunctions, deactivate the thrust reverser.
(1)
Make sure the thrust reverser is locked in the forward position.
(a)
Look at the links from the aft inboard side of each actuator fairing.
(b)
The over center links and guide carriage must be in the locked over center position (Fig. 202).
(2)
Lockwire the reverse thrust lever to the forward thrust lever.
(3)
Install a ground lock Cap and Pin on the applicable isolation valve in the air conditioning equipment bay (Fig. 203).
(4)
Open the thrust reverser circuit breaker and attach a DO NOT CLOSE tag.
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