NOTE: It is satisfactory for the blade to touch the extreme
____ outboard or inboard limit of the wiper sweep pattern if you apply a large amount of water to the windshield.
(d)
Set the WIPER switch to OFF.
(e)
Make sure that the wiper returns to the parked position with the wiper blade (1) under the restrainer (4).
(f)
Make sure that the distance between the inboard side of the wiper arm and the outboard side of the wiper blade is not more than 1.50 inches (figure 401).
(g)
Set the WIPER switch to HI.
(h)
Make sure that the wiper moves smoothly and freely.
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747-400 MAINTENANCE MANUAL
(i)
Set the WIPER switch to OFF.
(j)
Make sure that the wiper returns to the parked position.
(k)
Make sure that the distance between the inboard side of the wiper arm and the outboard side of the wiper blade is not more than 1.50 inches.
CAUTION: THE WIPER BLADE MUST BE PARALLEL TO THE WIPER ARM WHEN IN
_______ THE PARKED POSITION. IF IT IS NOT PARALLEL, THE WIPER BLADE WILL LIFT DURING FLIGHT.
(l) Make sure that the wiper moves to the parked position with the wiper blade under the restrainer (4).
S 824-029
(6) If the wiper blade movement is not centered on the windshield or if the wiper blade does not move parallel to the wiper arm so the outboard tip of the blade touches the wiper stop (14) when parked, adjust the assembly:
NOTE: Correct park adjustment is necessary for correct wiper
____ operation. You must adjust the wiper arm if the hub is not in the correct position on the motor/converter shaft.
(a)
Find the number of teeth which the adjustment bushing (12) must move for the correct park position and scan pattern (Fig 401).
(b)
Mark a line on the hub (10), adjustment bushing (12), and the motor/converter shaft.
(c)
Remove the hub and the bushing from the shaft and rotate the bushing in the applicable direction.
(d)
Set the wiper blade parallel to the wiper arm assembly.
(e)
Align the wiper blade (1) parallel with the wiper arm (5) with the blade under the restrainer (4).
(f)
Install the hub (10) onto the motor/converter shaft (the shaft is at the parked position). 1) Make sure that the backlash of the motor/converter goes
away when you apply light finger pressure on the arm toward the windshield. 2) Make sure that the blade (1) touches the wiper stop (14).
(g)
Install the washer (9) and the holddown screw (8).
(h)
Tighten the hub clamp screw (11).
H. Put the Airplane to the Usual Condition
S 864-030
(1) Open 7E1, WSHLD WIPER L and 7E25, WSHLD WIPER R circuit breakers on the P7, Overhead Circuit Breaker Panel.
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(2) S 114-031Clean the screw heads and slots on the hub (10).
NOTE:____ Use a small brush to apply aliphatic naphtha for cleaning. Rub the naphtha off with a clean cloth before it becomes dry.
(3) S 344-032Use the sealing gun to fill the screw slots and the clamp slit in the wiper arm hub (10) with sealant (use a spatula to get a smooth surface on the sealant).
(4) S 864-033Close these circuit breakers: (a) P7, Overhead Circuit Breaker Panel 1) 7E1, WSHLD WIPER L 2) 7E25, WSHLD WIPER R (b) P6, Main Power Distribution Panel 1) 6B34, WINDOW HEAT 1L PWR 2) 6B17, WINDOW HEAT 1R PWR (c) P180, DC Power Distribution Panel 1) 180H26, WDO HEAT CONT 1L 2) 180H12, WDO HEAT CONT 1R
(5) S 864-034Remove electrical power if it not necessary (AMM 24-22-00/201).
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