(k)
Adjust position of switches to move them inboard by amount of clearance measured in step (j) plus an additional 0.07 to 0.11 inch. Tighten both nuts securing each switch.
(l)
Clean molding clay from switch actuating plates.
(m)
Install standby motor on door actuator assembly. Refer to 52-61-591, Forward Airstair Door Standby System Motor - Removal/Installation.
(n)
Close the forward airstair circuit breakers on panel P6-4:
(o)
Operate forward airstair door electrically (normal operation and standby operation) and check that each switch actuates properly to stop actuator and extinguish STAIRS IN OPERATION warning light (at internal control station) when airstair door is closed.
(p)
With door closed extend airstair door latch pin and check that it clears crosspin on door latch fitting by at least 0.02 inch. (Fig. 504)
(q)
Open airstair door and apply lump of molding clay to all eight bearing plates around door opening.
(r)
Close airstair door electrically (normal operation and standby operation). When actuator has stopped, open door again and check that all door stop pins have contacted bearing plates.
(s)
If steps (p) and/or (r) indicate that airstair door is not traveling far enough when closing, adjust position of door closed limit switch (one or both as necessary) to move it slightly outboard as necessary.
(t)
Repeat step (o).
(u)
When adjustment is satisfactory, lockwire both nuts securing each switch, and clean molding clay from bearing plates.
500
52-61-0 Page 508 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 15/73
501 Door Closed Limit Switch Adjustment
May 01/74 Figure 504 52-61-0
Page 509
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
2. Forward Airstair and Door Test
A. General
(1) Prior to testing the mechanical and electrical operation of the airstair and door, the following conditions are assumed to have complied with:
(a)
The airstair door, its carriage and latch mechanism, and all associated switches are properly installed and rigged.
(b)
The airstair and all associated switches are properly installed and rigged.
(c)
The desired form of electrical power from either APU or external ac power unit is available on the airplane.
(d)
The FORWARD AIRSTAIR TREAD LIGHTS switch on attendants forward auxiliary panel is in AUTO position.
(e)
The following circuit breakers on panel P6-4 are closed:
1) FORWARD AIRSTAIR CONTROL
2) FORWARD AIRSTAIR DOOR
3) FORWARD AIRSTAIR ACTUATOR
4) FORWARD AIRSTAIR STANDBY CONTROL
5) FORWARD AIRSTAIR STANDBY
6) FORWARD AIRSTAIR TREAD LIGHTS
(f)
The height of the forward entry door threshold above ground line is between 90 inches and 105 inches.
CAUTION: TESTING OF FORWARD AIRSTAIR AND DOOR SHOULD NOT BE PERFORMED WITH AIRPLANE IN JACKED POSITION WITHOUT PROVIDING A SUPPORT FOR LOWER END OF AIRSTAIR IN ITS FULLY EXTENDED POSITION.
(g)
The airstair is fully retracted and airstair door is closed and latched.
(h)
The forward entry door is closed and latched.
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52-61-0 Page 510 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 15/69
CAUTION: THE AIRSTAIR SHOULD NOT BE OPERATED MORE FREQUENTLY THAN THREE CONSECUTIVE CYCLES WITH NORMAL SYSTEM AND/OR THREE CONSECUTIVE CYCLES WITH STANDBY SYSTEM WITHIN A 20-MINUTE PERIOD.
B. Test Airstair and Door
(1) Extend airstair fully by moving exterior control handle to NORMAL EXTEND position.
(a) Door and airstair operation should be smooth and free of binding.
CAUTION: USE CAUTION DURING EXTENSION AND BE ALERT TO POSSIBLE INTERFERENCE CONDITIONS. CLEARANCE BETWEEN AIRSTAIRAND DOOR CUTOUT SHOULD NEVER BE LESS THAN
0.25 INCH.
500
Feb 15/72 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 52-61-0 Page 511
(b)
Check that airstair door actuator jackscrew ballnut (Section A-A, Fig. 503) is not in contact with snubber with door in the fully open position. 1) If necessary, readjust door open limit switches within adjustment range shown in
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