S 864-038
(3)
Open 7E1, WSHLD WIPER L and 7E25, WSHLD WIPER R circuit breakers on the P7, Overhead Circuit Breaker Panel.
S 434-046
CAUTION: USE ONLY SCREWS WHICH HAVE THE NYLON LOCKING FEATURE TO ATTACH
_______ THE WIPER BLADE. IT IS POSSIBLE THAT OTHER SCREWS WILL BECOME LOOSE. THIS CAN CAUSE A LOSS OF THE BLADE AND DAMAGE TO THE WINDSHIELD.
(4) Install the wiper blade (1) with 2 washers (3) and screw (2).
NOTE: Reuse of wiper blade attach screws, wiper arm pressure plate
____ screws, holddown screw and hub clamp screw is not recommended.
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S 714-045
(5)
Make sure that the wiper blade turns freely at its attachment point.
S 424-044
(6)
Attach the wiper arm:
(a)
Position the wiper arm (5) in the hub (10).
(b)
Install the pressure plate (6) and the screws (7). Do not tighten the screws (7).
S 424-042
(7) If the wiper arm hub (10) was removed from the motor/converter, install the hub/arm/blade assembly:
(a)
Apply grease to the serrations on the hub (10) and the motor/converter shaft.
(b)
Turn the unlatch lever (15) and align the wiper blade (1) parallel with the wiper arm (5) with the blade under the restrainer (4).
(c)
Install the hub (10) onto the motor/converter shaft (the shaft is at the parked position).
(d)
You may need to move the adjustment bushing (12) to put the wiper arm (5) in the parked position (figure 401). 1) Make sure that the backlash of the motor/converter goes
away when you apply light finger pressure on the wiper arm toward the windshield. 2) Make sure that the wiper blade (1) touches the wiper stop (14).
(e)
Install the washer (9) and the holddown screw (8).
(f)
Tighten the hub clamp screw (11).
G. Wiper Operation Check and Adjustment
S 434-025
(1) Place the unlatch lever (15) on the top side of the wiper blade release stud.
(a) Tighten the pressure plate screws (7).
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MAINTENANCE MANUAL
S 224-040
(2) Make sure that the angles between the wiper arm and the wiper blade are correct:
(a)
Make sure that the angle between the unlatch lever (15) and the wiper arm (5) centerline is 25 |3 degrees.
(b)
If the angle is not correct, adjust the rod:
1) Loosen the locknut (16) on the rod (13).
2) Turn the rod to get the proper angle.
3) Tighten the locknut.
(c)
Move the unlatch lever (15) to the opposite side of the wiper arm (5) until the lever stops.
(d)
Make sure that the angle between the unlatch lever (15) and the wiper arm centerline is 35 degrees minimum.
S 864-026
(3) Close 7E1 WSHLD WIPER L and 7E25 WSHLD WIPER R circuit breakers on the P7 Overhead Circuit Breaker Panel.
NOTE: If the hub assembly was not replaced, then only the
____ "wiper arm to wiper blade angle" of the "wiper Operation Check and Adjustment" needs to be completed.
S 864-027
(4)
Provide electrical power (AMM 24-22-00/201).
S 714-028
(5)
Make sure the wiper operates correctly:
CAUTION:_______MAKE SURE TO APPLY WATER TO THE WINDSHIELD. WIPER OPERATION WILL CAUSE DAMAGE TO A DRY WINDSHIELD.
(a)
Apply water to the windshield.
(b)
Set the WIPER switch on the anti-ice/rain removal module to LO.
(c)
See that the wiper operates smoothly and does not overlap the window seal strips.
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本文链接地址：747-400 AMM 飞机维护手册 防冰和排雨 ICE AND RAIN PROTECTION(64)
