(2)
Pressurize hydraulic system A (Ref 27-81-0, Maintenance Practices).
(3)
Close the following circuit breakers on circuit breaker panel P6:
(a)
BATT BUS and IND LTS
(b)
SECTION 1
(c)
LE FLAP POS IND AC
(d)
LE FLAP POS IND DC
(e)
FLAP SHUTOFF VALVES
(f)
STBY RUD and STBY HYDR PUMP CONT
(g)
NO. 1 GEN BUS IND
(h)
STBY HYD PUMP (Normal)
(i)
SECTION 4
(j)
NO. 1 DC IND LTS
(k)
LANDING GEAR IND LTS
B. Test Leading Edge Flap and Slat Proximity Sensors
(1)
Position flap control lever in FLAP UP detent position.
(a)
Check that each flap and slat is in up position and faired with wing structure.
(b)
Check that all leading edge flap lights on center instrument panel and on aft overhead annunciator panel are extinguished.
(c)
Press test switch below leading edge devices annunciator on aft overhead panel. Check that all lights illuminate (10 amber and 16 green lights).
(d)
Release test switch for leading edge devices annunciator. Check that all lights extinguish.
(2)
Place flap handle in 1-unit detent.
(a)
As trailing edge flaps begin to extend, check that amber LE Flap Transit light on forward panel illuminates.
(b)
As each flap and slat starts to extend, check that respective amber lights on overhead annunciator illuminate (10 amber).
(c)
As leading edge slats lock in intermediate EXTEND position, check that annunciator transit lights extinguish and that associated slat EXT green lights illuminate (6 green).
(d)
As leading edge flaps lock in their extended position, check that annunciator transit lights extinguish and that associated flap green lights illuminate.
(e)
When flap and slat green lights are all illuminated, check that forward panel LE Flap Transit light extinguishes and that LE Flaps Extend light illuminates.
(f)
To verify that each proximity sensor is properly connected, place a piece of copper sheet of convenient size between sensor face and actuating bar of extend sensors for each flap and slat. Check that associated green lights go out and amber light illuminates with copper shield in place. Check that lights return to EXT configuration when copper is removed.
(3)
Place flap handle in 5-unit detent.
(a) Check that no change occurs in position of any of leading edge devices or in indicator illumination.
(4)
Place flap handle in 10-unit detent.
(a)
As trailing edge flaps travel toward 10 units, check that forward panel LE Flap Extend light extinguishes and that LE Flap Transit light illuminates.
(b)
As slats 1 through 6 start to extend, check that respective slat extend green lights on overhead annunciator extinguish and that associated amber transit lights illuminate.
(c)
As slats lock in full extend position, check that respective annunciator transit lights extinguish and associated slat extend green lights illuminate.
(d)
When annunciator green lights are all illuminated, check that forward panel LE Flap Transit light extinguishes and that LE Flap Ext light illuminates.
(5)
Extend trailing edge flaps to 40-unit positions and then back to 10-unit position. Check that no change occurs in position of any of leading edge devices or in indicator light illuminates.
(6)
Place flap handle in 5-unit detent.
(a) As slats retract to intermediate position, check that respective green extend lights illuminate.
(7)
Place flap handle in 1-unit detent.
(a) Check that no change occurs in positions of any of leading edge devices or in indicator light illuminations.
(8)
Place flap handle in full up detent.
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(a) When each leading edge device is in up and locked position, check that respective amber lights extinguish and that no green lights illuminate.
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