(f)
Check operation of engine No. 2 reverser by placing No. 2 override switch in OVERRIDE; follow the same procedure outlined in steps 6.(c) and (d) and monitor the No. 2 REVERSER UNLOCKED light.
(g)
Return engine No. 2 thrust reverser override switch to NORMAL.
(h)
Depressurize standby hydraulic system.
(7)
Check operation of thrust reverser isolation valve light as follows:
(a)
Position landing gear selector lever to OFF and check that standby hydraulic system is not pressurized.
(b)
Move engine No. 1 thrust reverser override switch to OVERRIDE. ISOLATION VALVE light shall come on and, after time delay of approximately 12 seconds, MASTER CAUTION and OVHD annunciator lights shall come on.
(c)
Position the LIGHTS switch on the P2 panel to DIM and check that lights dim.
(d)
Return LIGHTS switch on the P2 panel to BRT. All lights will return to original brightness.
(e)
Return engine No. 1 thrust reverser override switch to NORMAL. ISOLATION VALVE, MASTER CAUTION and OVHD annunciator lights shall go out.
(f)
Repeat steps (b) and (e) with engine No. 2 thrust reverser override switch.
(8)
Operate thrust reversers using alternate pressure source.
(a)
With landing gear selector lever in the OFF position, pressurize standby hydraulic system and move both thrust reverser override switches to OVERRIDE. ISOLATION VALVE, MASTER CAUTION and OVHD annunciator lights will remain off.
NOTE: MASTER CAUTION and OVHD annunciator lights may remain on due to signals from other systems. If this occurs, extinguish these lights by pressing either MASTER CAUTION light.
(b)
Rotate both reverse thrust levers rapidly aft to limits of travel. 1) Both thrust reversers shall fully deploy within 7 seconds of completion of thrust
lever movement.
2) Both REVERSER UNLOCKED lights shall illuminate.
(c)
Rotate both reverse thrust levers to the OFF position.
1) Both thrust reversers shall move toward stow position.
2) Both REVERSER UNLOCKED lights may go out.
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NOTE: Incomplete stowage of one or both thrust reversers may occur. Repressurizing the hydraulic system “A” will cause the reversers to stow and REVERSER UNLOCKED lights to extinguish.
3) Both forward thrust levers shall be free to advance. (Return levers to IDLE STOP after trial movement.)
(d)
Deleted
(e)
Position landing gear selector lever to DOWN.
(f)
Depressurize standby hydraulic system.
(g)
Return both thrust reverser override switches to NORMAL.
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(9)
thru (12) Deleted
(13)
Provide a simulated engine run, and check operation of fire switches.
(a)
Open engines No. 1 and 2 THRUST REVERSER circuit breakers, and SEC 2 and SEC 5 circuit breakers under INDICATOR on the P6 panel.
(b)
Remove disconnect D752 from engine low oil pressure switch on both engines, and jumper between pins 1 and 2 of disconnect on engines No. 1 and 2.
(c)
Close SEC 2, SEC 5, and engines No. 1 and 2 THRUST REVERSER circuit breakers.
(d)
Rotate both reverse thrust levers aft to the interlock stop.
1) REVERSER UNLOCKED lights shall come on.
2) Both thrust reversers will move to reverse thrust position.
(e)
Pull the No. 1 and 2 fire switches on P8 panel using the override button.
CAUTION: DO NOT ROTATE HANDLE.
(f)
Rotate both reverse thrust levers to the OFF position. Thrust reversers shall remain deployed and REVERSER UNLOCKED lights shall remain illuminated.
(g)
Position both thrust reverser override switches to OVERRIDE; thrust reversers shall remain deployed and all lights shall remain unchanged.
(h)
Return both thrust reverser override switches to NORMAL and push in both engine fire switches. Thrust reversers will return to forward thrust position.
(14)
On airplanes with nose gear air-ground switch and without SB 78-1050, check operation of nose landing gear air-ground sensing system; on all other airplanes proceed directly to step (15).
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(a) Jack nose of airplane at fuselage jacking point until nose wheel clears ground.
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