(d)
Install ground lock on engine No. 1 thrust reverser isolation valve.
(e)
Open engine No. 1 THRUST REVERSER circuit breaker on P6 circuit breaker panel.
(f)
Depressurize hydraulic system A (Ref 29-11-0 MP).
(g)
Remove upper lock access panel.
(h)
Remove latch access panel from hydraulic access panel located at bottom of thrust reverser shroud.
(i)
Apply a slug (made from carbon or low alloy steel approximately 1.00 by 2.00 inches, 0.06-inch thick) to the upper proximity sensor. 1) The engine No. 1 REVERSER UNLOCKED light shall remain illuminated.
Aug 01/95 78-32-01
Page 510E
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(j)
With the slug remaining on the upper sensor, apply a like slug to the lower sensor. 1) The engine No. 1 REVERSER UNLOCKED light shall extinguish.
(k)
Remove slug from the upper sensor. 1) The engine No. 1 REVERSER UNLOCKED light shall illuminate.
(l)
Remove slug from the lower sensor. 1) The REVERSER UNLOCKED light shall remain illuminated.
(m)
Close engine No. 1 THRUST REVERSER circuit breaker on P6 circuit breaker panel.
(n)
Pressurize hydraulic system A (Ref 29-11-0 MP).
(o)
Remove ground lock from thrust reverser isolation valve.
(p)
Move engine No. 1 thrust reverser override switch to OVERRIDE.
(q)
Rotate engine No. 1 reverse thrust lever to the OFF position. 1) Engine No. 1 thrust reverser shall move to the forward thrust position. 2) Engine No. 1 REVERSER UNLOCKED light shall extinguish.
(r)
Move override switch to NORMAL.
(s)
Repeat steps (a) thru (r) for the thrust reverser on engine No. 2 using the engine No. 2 reverse thrust lever, override switch, isolation valve and switch, proximity sensors and observing the engine No. 2 REVERSER UNLOCKED light.
(t)
Install access panels on thrust reversers.
E. Restore Airplane to Normal
(1)
Open both THRUST REVERSER circuit breakers, and SEC 2 and SEC 5 circuit breakers under INDICATOR on P6 panel.
(2)
Remove jumpers from disconnects D752 on both engines.
(3)
Install disconnect D752 to engine low oil pressure switch on both engines.
(4)
Depressurize A and B hydraulic systems (Ref 29-11-0 MP).
(5)
Install ground locks on both thrust reverser isolation valves.
(6)
Close both THRUST REVERSER circuit breakers and SEC 2 and SEC 5 circuit breakers under INDICATOR on P6 panel.
(7)
Place landing gear selector lever in DOWN position.
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78-32-01 Page 510F BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/91
F. Check engine pressure ratio (EPR) with reverse thrust lever at minimum power (No. 1) detent.
NOTE: Reverse thrust detent check is to be accomplished during systems check but may be performed separately under the following conditions:
(1)
When engines are re-trimmed.
(2)
When engine fuel control is replaced.
(3)
When reverse thrust detent components are replaced or re-rigged.
(4)
When engine has been replaced.
NOTE: Adjust each engine separately.
(1)
Turn off all air bleed and electrical load.
(2)
Disconnect the reverse thrust follow-up push-pull cable from the reverser mechanism by removing the fasteners connecting the push-pull cable rod end to the crank arm at the thrust reverser.
(a)
Rotate the interlock cam in the direction which allows use of the reverse thrust lever by pulling the push-pull cable until it stops.
(b)
Open reverse thrust isolation valve circuit breakers.
(c)
Install pin to lock isolation valve in closed position.
(3)
Advance reverse thrust lever beyond No. 1 detent to approximately No. 2 detent (do not exceed takeoff thrust), and retard lever until No. 1 detent is contacted.
(4)
Allow engine to stabilize for 30 seconds and check that EPR falls within tolerance zone for ambient temperature of engine model being checked (Fig. 503).
(5)
To bring EPR reading to within specified range, adjust detent cam or the roller mechanism as follows:
(a)
Rotate reverse thrust lever to position roller assembly into minimum (No. 1) cam detent.
(b)
Back out cam lock bolt until cam slips loose from taper friction lock.
(c)
With roller assembly remaining in cam detent, advance reverse thrust lever 0.2 EPR minimum beyond required value (do not exceed takeoff thrust). Retard lever until EPR does comply with applicable engine model and tighten lock bolt to 25/30 pound-inches.
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