(4)
Disconnect detent spring from cam roller lever arm.
(5)
Install rig pin SB-1 in forward drum quadrant.
(6)
Loosen bolts in cam roller lever arm bracket and adjust to align roller contact surface with index mark on detent cam. Tighten bolts.
(7)
Connect detent spring to cam roller lever arm and remove rigging pin SB-1 from forward drum quadrant.
(8)
Move speed brake control lever aft until roller on cam roller lever arm is in ARMED detent.
(9)
Check that indicator on aft face of control lever aligns with ARMED mark on control stand indicator plate. If not within limits, place speed brake control lever in DOWN position then check roller for alignment with index mark on detent cam.
(a) If roller does not align, repeat steps (4) thru (7).
(10)
Move speed brake control lever aft until cam roller is in FLIGHT detent on cam.
(11)
Check that indicator on aft face of speed brake control lever aligns within FLIGHT DETENT band on control stand indicator plate. If not within limits, repeat steps (1) thru (9).
(12)
Place speed brake control lever in DOWN position, then move control lever to UP position. Check that control lever travel is 48 degrees minimum. If control lever is restored from full travel, check adjustment of speed brake; full travel stop on spoiler ratio changes (Ref 27-62-0 A/T).
(13)
Install control stand access panel.
G. Adjust speed brake takeoff warning and arming switches (Ref 27-62-111/401).
H. Test speed brake forward drum and lever brake. Refer to Speed Brake Forward Drum and Lever Brake - A/T.
I. Close lower fuselage nose compartment access door.
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27-62-21 Page 410 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 20/91
SPEED BRAKE FORWARD DRUM AND LEVER BRAKE - ADJUSTMENT/TEST
1. Speed Brake Forward Drum and Lever Brake Test
A. Equipment and Materials
(1)
Spring Scale - capacity 0 to 50 pounds
(2)
Control Column Protractor Assembly-4MIT65B80307-1 (Preferred) or F52485-500 (Optional) which is used with the following adapters:
(a)
Aileron Control Wheel Protractor Mount-F72790
(b)
Forward Thrust Lever Protractor Adapter-F72952-2
(3)
Control Surface Protractor Stand Assembly - F71292-17
(4)
Antiskid - Autobrake - Auto Speed Brake Tester - F80129
B. Prepare Speed Brake Forward Drum and Lever Brake for Test
(1)
Connect electrical power to airplane. Energize 28-volt dc bus No. 1 and 2 and battery bus.
(2)
Provide system A hydraulic power (Ref 27-62-0, Maintenance Practices).
(3)
Set aileron trim control knob in zero trim position.
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May 01/99 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-62-21 Page 501
C. Test Speed Brake Forward Drum and Lever Brake
(1)
Test speed brake lever friction.
(a)
Position spoiler system A and B switches to OFF.
(b)
Move speed brake control lever from DOWN to UP for several cycles. Check system for binding or roughness in operation. Check that speed brake control lever does not rub on control stand.
(c)
Using spring scale at the tip of the speed brake control lever check that the maximum lever loads are as follows: 1) DOWN to FLIGHT DETENT - 20 pounds maximum. 2) FLIGHT DETENT to UP - 28 pounds maximum. 3) UP to FLIGHT DETENT - 28 pounds maximum. 4) FLIGHT DETENT to DOWN - 20 pounds maximum.
(2)
Check speed brake holding action.
(a)
Position speed brake lever at an intermediate position, not in a detent.
(b)
Rotate aileron control wheel for several cycles.
(c)
Check that speed brake lever has not been moved by system backlash.
(3)
Test for normal spoiler operation.
(a)
Position spoiler system A and B switches to ON.
(b)
Set speed brake control lever in DOWN position.
(c)
Check that all spoilers are full down.
(d)
Move speed brake control lever into ARMED detent.
(e)
Check that all ground spoilers remain full down and flight spoilers do not extend beyond 1-1/2 degrees.
(f)
Move speed brake control lever to UP position.
(g)
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