chapter 32 - landing gear - discovery · pdf filelanding gear xl-2 airplane chapter 32 p/n...

LANDING GEAR XL-2 AIRPLANE
P/N 135A-970-100 Chapter 32 REVISION E Page 1 of 90
CHAPTER 32
LANDING GEAR

Chapter 32 P/N 135A-970-100 Page 2 of 90 REVISION E
Copyright 2009 All rights reserved. The information contained herein is proprietary to Liberty Aerospace, Incorporated. It is prohibited to reproduce or transmit in any form or by any means, electronic or mechanical, including photocopying, recording, or use of any information storage and retrieval system, any portion of this document without express written permission of Liberty Aerospace Incorporated. Loctite is a registered trademark of Henkel AG & Co. KGaA , and Henkel Corporation USA.

P/N 135A-970-100 Chapter 32 REVISION ~ Page 3 of 90
Table of Contents
SECTION 32-00 GENERAL 5 SECTION 32-10 MAIN LANDING GEAR 7
SECTION 10-01 PERIODIC MAINTENANCE 7 SECTION 10-02 MAIN LANDING GEAR PROCEDURES 7
MAIN LANDING GEAR ASSEMBLY REMOVAL 8 MAIN LANDING GEAR ASSEMBLY INSTALLATION 10 MAIN LANDING GEAR OPERATIONAL CHECK AND INSPECTION 11
SECTION 10-03 MAIN LANDING GEAR TROUBLESHOOTING GUIDE 12 SECTION 32-20 NOSE LANDING GEAR 13
SECTION 20-01 PERIODIC MAINTENANCE 13 SECTION 20-02 NOSE LANDING GEAR PROCEDURES 13
NOSE LANDING GEAR ASSEMBLY REMOVAL 14 NOSE LANDING GEAR ASSEMBLY INSTALLATION 16 NOSE LANDING GEAR OPERATIONAL CHECK AND INSPECTION 17
SECTION 20-03 NOSE LANDING GEAR TROUBLESHOOTING GUIDE 18 SECTION 32-40 WHEELS AND BRAKES 19
SECTION 40-01 WHEEL FAIRINGS 19 SECTION 40-02 PERIODIC MAINTENANCE 22 SECTION 40-03 WHEEL FAIRING PROCEDURES 22
MAIN WHEEL FAIRING INITIAL INSTALLATION 23 NOSE WHEEL FAIRING INITIAL INSTALLATION 25 MAIN WHEEL FAIRING REMOVAL 26 NOSE WHEEL FAIRING REMOVAL 27 MAIN WHEEL FAIRING INSTALLATION 28 NOSE WHEEL FAIRING INSTALLATION 29 WHEEL FAIRING OPERATIONAL CHECK AND INSPECTION 31
SECTION 40-04 WHEEL FAIRING TROUBLESHOOTING GUIDE 32 SECTION 40-05 WHEELS 33 SECTION 40-06 PERIODIC MAINTENANCE 33 SECTION 40-07 WHEEL PROCEDURES 33
NOSE WHEEL REMOVAL 34 NOSE WHEEL INSTALLATION 35 MAIN WHEEL REMOVAL 36 MAIN WHEEL INSTALLATION 37 WHEEL OPERATIONAL CHECK AND INSPECTION 39
SECTION 40-08 WHEEL TROUBLESHOOTING GUIDE 40 SECTION 40-09 TOE BRAKE SYSTEM 42 SECTION 40-10 PERIODIC MAINTENANCE 44 SECTION 40-11 TOE BRAKE PROCEDURES 44
TOE BRAKE MASTER CYLINDER REMOVAL 45 TOE BRAKE MASTER CYLINDER INSTALLATION 47 TOE BRAKE OVER-CENTER STOP REMOVAL AND INSTALLATION 49 PARKING BRAKE VALVE REMOVAL 50 PARKING BRAKE VALVE INSTALLATION 51 TOE BRAKE OPERATIONAL CHECK AND INSPECTION 52
SECTION 40-12 TOE BRAKE TROUBLESHOOTING GUIDE 53 SECTION 40-13 FINGER BRAKE SYSTEM 55 SECTION 40-14 PERIODIC MAINTENANCE 56 SECTION 40-15 FINGER BRAKE SYSTEM PROCEDURES 56

Chapter 32 P/N 135A-970-100 Page 4 of 90 REVISION ~
FINGER BRAKE MASTER CYLINDER REMOVAL 57 FINGER BRAKE MASTER CYLINDER INSTALLATION 59 FINGER BRAKE OPERATIONAL CHECK AND INSPECTION 60
SECTION 40-16 FINGER BRAKE TROUBLESHOOTING GUIDE 61 SECTION 40-17 MAIN WHEEL BRAKE CALIPER SYSTEM 63 SECTION 40-18 PERIODIC MAINTENANCE 63 SECTION 40-19 MAIN WHEEL BRAKE CALIPER SYSTEM PROCEDURES 63
MAIN WHEEL BRAKE CALIPER REMOVAL 65 MAIN WHEEL BRAKE CALIPER INSTALLATION 67 BRAKE CALIPER PAD/LINER REPLACEMENT 69 BRAKE BLEEDING PROCEDURE 74 BRAKE CALIPER OPERATIONAL CHECK AND INSPECTION 76
SECTION 40-20 MAIN WHEEL CALIPER SYSTEM TROUBLESHOOTING GUIDE 78 SECTION 32-50 STEERING 79
SECTION 50-01 PERIODIC MAINTENANCE 79 SECTION 50-02 STEERING PROCEDURES 79
NOSE GEAR LEG SERIAL NUMBER VERIFICATION 80 CASTOR STOP/FRICTION BASE REMOVAL 82 CASTOR STOP/FRICTION BASE INSTALLATION 83 NOSE GEAR SHIMMY DAMPER TORQUE TEST 85 NOSE GEAR STEERING OPERATIONAL CHECK AND INSPECTION 87
SECTION 50-03 STEERING TROUBLESHOOTING GUIDE 89

P/N 135A-970-100 32-00 REVISION ~ Page 5 of 90
Section 32-00 General The Liberty XL-2 landing gear is a fixed tricycle landing gear. All of the three landing gear wheels employ 5.00 x 5 tires (with inner tubes) inflated to a pressure of 50 +2 /-0 psi for all three tires.
The main undercarriage (U/C) landing gear legs are fabricated from single billets of heat-treated aluminum. Machined surfaces at the top of the gear leg provide a bearing surface for the inboard attachment bolt, one of the two points at which each gear leg is secured to the center fuselage space frame. A specific arrangement of fasteners, including a Belleville spring washer and a flexible bushing, is required to secure the inboard end of the gear leg. At the outer portion of the space frame, the gear is secured in a saddle with two additional bolts. Self-locking castellated nuts and split pins are used to secure all three bolts for each landing gear leg. Disc brakes are installed on the Port and Starboard main landing gear wheels. Steering is effected by differential application of the main landing gear brakes.
At its lower extremity, each main landing gear leg employs machined surfaces to locate and accommodate the wheel brake caliper mounting plate and the wheel axle.
The nose undercarriage leg is fabricated from solid heat-treated spring steel. The assembly is free to caster (steer) left / right up to 85. A caster stop prevents rotation beyond this point to prevent interference between the nose landing gear and the propeller.
Access to the nose attachment fitting, main gear attachment fittings, and the cockpit components of the Finger Brake System are obtained by removal of the fuselage belly fairing, cover-plate upper undercarriage legs, and wheel fairing as necessary.
The Toe Brake Systems master cylinders are accessible from inside the cockpit. The parking brake valve is accessible by removal of the belly fairing, cover-plate upper undercarriage legs, and wheel fairing as necessary.

32-00 P/N 135A-970-100 Page 6 of 90 REVISION ~
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Section 32-10 Main Landing Gear Section 10-01 Periodic Maintenance
Periodic Main Landing Gear maintenance entails operational checks and inspections performed at intervals specified in the Liberty Maintenance Manual, Chapter 05 and in accordance with the operational check and inspection procedure in this section.
Section 10-02 Main Landing Gear Procedures This section contains the procedures for the removal and installation of the main landing gear.

MAIN LANDING GEAR ASSEMBLY REMOVAL Perform this procedure to remove the main landing gear assembly. This procedure applies to both the port and starboard main landing gear assembly.
Minor spillage of brake fluid is unavoidable. Place absorbent material below fitting area as required; and have appropriate plastic caps or plugs available for both fuselage brake line and landing gear fitting.
1. Securely chock opposite main undercarriage landing gear and nose landing gear.
2. Remove fuselage belly fairing, cover-plate upper undercarriage legs, and wheel fairing if applicable.
3. If removing PORT main landing gear, disconnect electric fuel boost pump from chassis attachment. in accordance with Liberty Maintenance Manual Chapter 28 - Fuel System.
4. Cut and remove safety wire. Remove two bolts securing brake caliper. Cut away three (3) tie-wraps around brake line and undercarriage leg. Tie back brake caliper and hose back to structure.
5. Remove and discard split pin from castellated nuts on all three main landing gear attachment bolts.
6. Jack the airplane, using jack point on undercarriage restraint lower (saddle) on gear to be removed, until wheel of gear to be removed is clear of floor. Place a padded sawhorse of sufficient height under second rib of wing, on jack side, to keep wheel off ground. Make sure wing flaps are retracted and sawhorse supports main wing spar. Remove center main gear attachment bolt, making careful note of position and order of all washers and flexible bushing.
7. Remove the jack from under undercarriage restraint lower (saddle) jack point.
8. Remove outboard main gear attachment bolts and main gear undercarriage lower restraint (saddle). Slide the main gear leg outboard clear of the space frame structure.

This completes the Main Landing Gear Assembly Removal procedure.
Figure 32-1 Exploded View of Main Landing Gear Attachment Bolt
Figure 32-2 Main Landing Gear Port Attachment Bolt and undercarriage Restraint Lower (Saddle)

MAIN LANDING GEAR ASSEMBLY INSTALLATION Perform this procedure to install the main landing gear assembly. This procedure applies to both the port and starboard main landing gear assemblies.
Any misalignment or tracking issue with the main landing gear may be an indicator of a hard landing; if this is suspected, perform the hard landing checklist in Chapter 05 - Time Limits/Maintenance Checks/Inspection Intervals.
1. Install flexible bushing in inboard end of main gear leg. 2. Place main landing gear leg in position. 3. Install outboard main gear attachment undercarriage lower restraint
(saddle) and bolts; tighten hand tight only at this time. Verify routing of hose.
4. Install inboard main gear attachment bolts with all hardware in

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