CAUTION: DO NOT JACK AT ANY POINT OTHER THAN JACK PAD.
(4)
Slowly raise axle jack to compress right main gear shock strut until ground spoiler interlock valve opens. Check that ground spoiler panels snap to full up.
(5)
Check that distance shock strut inner cylinder is compressed from fully extended condition is 1.5 (+1.5/-0.0) inches.
(6)
Place speed brake control lever in DOWN position. Check that ground spoiler panels fully retract.
(7)
Lower axle jack and allow right main gear shock strut to fully extended. Remove axle jack.
(8)
Check that ground spoiler panels are full down.
C. Restore Airplane to Normal
(1)
Remove systems A and B hydraulic power. Refer to 27-62-0.
(2)
Remove electrical power if no longer required.
(3)
Service right main gear shock strut. Refer to Chapter 12, Main Landing Gear Shock Strut -Servicing.
(4)
Lower and remove jacks.
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NO. 4 AND 5 GROUND SPOILER ACTUATOR - REMOVAL/INSTALLATION
1. Equipment and Materials
A. Fire resistant hydraulic fluid - BMS 3-11 or Skydrol Assembly Lube - MCS352
2. Prepare for Removal
A. Provide electrical power.
B. Provide system A hydraulic power. Refer to 27-62-0, Speed Brake Control System -Maintenance Practices.
C. Position flap control lever to FLAP DOWN position to lower the trailing edge flaps.
D. Remove system A hydraulic power. Refer to 27-62-0.
E. Depressurize hydraulic system A. Refer to 27-62-0.
3. Remove Ground Spoiler Actuator
A. Disconnect two hydraulic lines on actuator. (See figure 401.)
NOTE: Provide a container to catch the hydraulic fluid leaking from fittings.
B. Install protective plugs in hydraulic lines.
C. Loosen nut on mounting bolt attaching piston rod end to idler crank.
D. Loosen nut on mounting bolt attaching actuator to structure.
E. Remove mounting bolts and remove actuator from airplane.
F. Remove two hydraulic unions from actuator and install protective caps.
4. Install Ground Spoiler Actuator
A. Remove protective caps from actuator.
B. Lightly lubricate O-rings with hydraulic fluid or assembly lube. Instal1 O-rings and hydraulic unions in actuator ports.
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G41020
No. 4 and 5 Ground Spoiler Actuator Installation 500
27-62-72 Figure 401 Nov 15/67
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
C. Locate actuator in airplane and install two mounting bolts with heads outboard. (See figure 401.)
D. Secure actuator piston rod end mounting bolt with nut and washer. Tighten nut 290-410 pound-inches.
E. Secure remaining actuator mounting bolt with nut and washer. Tighten nut 630-950 pound-inches.
F. Ensure that hydraulic system A is depressurized and then remove protective plugs from hydraulic lines.
G. Align and tighten hydraulic lines.
H. Pressurize hydraulic reservoirs. Refer to Chapter 29, Hydraulic Reservoir Pressurization.
I. Place SPOILER A and B switches in OFF position.
J. Remove systems A and B hydraulic power. Refer to 27-62-0.
K. Actuate speed brake control lever to bleed spoiler actuators.
L. Check that there is no hydraulic leakage at actuator.
M. Adjust and test actuator installation. Refer to Ground Spoiler Actuator Adjustment/Test.
5. Return Airplane to Normal
A. Position flap control to FLAP UP position to raise trailing edge flaps.
B. Remove systems A and B hydraulic power. Refer to 27-62-0.
C. Remove electrical power if no longer required.
D. Check hydraulic reservoirs and service if required. Refer to Chapter 12, Hydraulic Servicing.
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NO. 4 AND 5 GROUND SPOILER ACTUATOR - ADJUSTMENT/TEST
1. Ground Spoiler Actuator Adjustment
A. Equipment and Materials
(1)
Corrosion Preventive Compound - MIL-C-11796, Class 3
(2)
Sealant - BMS 5-95, Type I, Class B-1/2 or BMS 5-95, Type II, Class B-2 (Preferred)
(3)
Sealant - BMS 5-26, Type II, Class B-2 (Optional)
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