(f)
Release the EPR test switch and return the flaps to zero units. Retard thrust levers to idle stop.
(8)
Test LE & TE Flap Takeoff Warning Functions (Airplanes without LE Warning Test switches)
(a)
Advance thrust levers to maximum forward thrust position.
(b)
Press and hold either EPR test switch on engine accessory module. Check that intermittent horn sounds.
(c)
Move TE flap lever to 1 unit detent. Check that LE and TE flaps extend and horn is silenced.
(d)
Install leading edge locks on flap actuators 1 and 4.
NOTE: Depressurize hydraulic system prior to installation and removal of flap actuator locks.
(e)
Insert copper shield between No. 1 LE flap extend sensor and its target plate. Check that LE No. 1 green light goes off, amber light comes on, and horn sounds.
(f)
Repeat step (d) at LE flap extend sensor No. 4.
(g)
Remove copper shield.
(h)
Move flap lever to FLAPS UP detent. Check that LE flaps 1 and 4 remain extended and horn sounds.
(i)
Move flap handle thru its full travel. Check that horn sounds except for flap positions 1 thru 25.
(j)
Move flap handle to any position between 1 and 25. Check that horn is silenced.
(k)
Remove actuator locks. Move flap lever to FLAPS UP detent. Check that LE and TE flaps retract and horn sounds.
NOTE: Depressurize hydraulic system prior to installation and removal of flap actuator locks.
(l)
Move flap lever between 1 and 25. Check that horn stops sounding.
(m)
Return flap handle to zero detent and release EPR test switch. Return thrust levers to idle stop. Check that horn is silent and EPR light goes out.
(9)
Test Speed Brake Arming Switch S276 (Fig. 502, Sheet 4)
(a) Perform test same as step 6.D.(5), Page 525.
(10)
Test Autobrake Off Ramp Switch S585 (if installed and connected).
(a)
Set speed brake lever to DOWN Position (Detail D, Fig. 502, Sheet 4).
(b)
Connect ohmmeter across terminals C and NO of switch and check for continuity between switch terminals.
(c)
Move speed brake lever aft until open circuit is obtained between switch terminals.
(d)
Check the speed brake lever is 3.28 to 3.84 inches aft from down and locked position.
(e)
Remove ohmmeter and set speed brake lever to down position.
(11)
Test parking brake input to Landing Gear Accessory Unit M338 (Airplanes incorporating SB 31-1049, SB 31-1054 or SB 31-1073)
(a)
Verify system A hydraulic power is available (Ref 27-51-0).
(b)
Position flaps to 5 units (Ref 27-51-0).
CAUTION: ENSURE THAT ALL PERSONNEL AND EQUIPMENT ARE CLEAR BEFORE MOVING CONTROL SURFACES.
(c)
Remove system A hydraulic power. Verify parking brake is released (Ref\32-44-0).
(d)
Verify that the speed brake lever on the P8 control stand is in the DOWN position.
(e)
Set the stabilizer trim control, on the P8 control stand, in the green band.
(f)
Advance both thrust levers into start of takeoff range.
(g)
On the engine accessory unit module, press and hold either of the engine pressure ratio (EPR) test switches.
(h)
Verify that the warning horn does not sound.
(i)
Release the EPR test switch.
(j)
Set the parking brake (Ref 32-44-0).
(k)
Press and hold either of the EPR test switches on the engine accessory unit module.
(l)
Verify that the warning horn sounds and that the parking brake light on the P8 control stand illuminates.
(m)
Release the parking brake.
(n)
Verify that the warning horn is silenced and that the parking brake light is
extinguished.
(o)
Release the EPR test switch.
(p)
Fully retard both thrust levers to idle position.
(q)
Restore airplane to normal.
(12)
Perform step 6.F. for airplanes with LE and TE Flap Aural Warning circuits.
501
Oct 20/91 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 31-26-0 Page 529
31-26-0 Apr 01/97
Page 530
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
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