Accomplish the disassembly of the steering dampener assembly in the order of the key index numbers assigned to the exploded view illustration in the “Intermediate Repair Section” of the MIM. Before reassembly, clean all parts with a suitable solvent. Air dry with warm, dry, low-pressure (10 psi) air. Nylon, rubber, and Teflon® parts are replaced and not cleaned. You should use the inspection standards in the MIM or applicable 03 manual to inspect all parts of the steering assembly. Reassembly is essentially a reversal of the dis- assembly order with appropriate quality assurance checks at specific steps. Following complete re- assembly, the steering assembly must undergo the following bench tests: 1. 2. 3. 4. 5. 6. 7. 8. 9. Proof pressure test Input torque test Steering resolution test (input motion versus output motion) Stall leakage test (output shaft in neutral and input shaft fully engaged, and then measure leakage No steer test (steering assembly in neutral, and then measure leakage at return) External leakage test Static friction torque test (clockwise and counterclockwise torque required to start movement of the output shaft in the power ON and power OFF conditions) Output torque test Steady dampening rate test The numerous steps involved in bench testing components, such as the steering assembly and the variations between it and other steering actuators, make it impractical to cover the individual steps in detail. Shop and quality assurance personnel must ensure that each component repaired at the intermediate maintenance level is actually in a ready-for-issue condition. This requires vigilance on the part of all personnel. A complete bench test must be made according to the test arrangements provided in the MIM or the applicable 03 manual. GENERAL LANDING GEAR SYSTEMS MAINTENANCE Learning Objective: Recognize procedures for drop checks, troubleshooting, alignment and adjustment, and the maintenance removal and replacement of landing gear components. Mandatory drop checks are required for all landing gear maintenance procedures that involve the removal and replacement of components, breaking of hydraulic lines or fittings, and any adjustments to gear or door linkages. Conditional maintenance requirements cards call for a drop check whenever the aircraft experiences a “hard landing.”  In addition, regular drop checks are required as part of the aircraft periodic inspection, even if there has been no reported discrepancy. DROP CHECK PROCEDURES All drop check operations should be performed as specified in the applicable maintenance instructions manual (MIM). These procedures should be thorough enough to ensure that the system is free of leaks and the operational integrity of the system has been restored following maintenance. Operational checks cover three distinct areas. They are the operation of the landing gear and doors, the operation of the landing gear position indicator and warning system, and the operation of the landing gear emergency system. The first step in the drop check procedures is to place the aircraft on jacks. Refer to chapter 3 of this training manual. Further preparation includes connection of a hydraulic test stand and external electrical power, removal of landing gear maintenance safety locks, and the proper placement of the landing gear control handle. As the operational procedure begins, check to make sure that the landing gear doors do not close in the path of the retracting main struts. This condition will be obvious (with hydraulic and electrical power on the aircraft) if the landing gear doors do not remain in the full open position when the landing gear control handle is placed in the UP position. Placing the landing gear control handle momentarily to the UP and DOWN positions several times will correct this condition by removing air from the wheel door cylinders. Regulate the hydraulic test stand to operate at a flow of 4 gpm, and slowly increase hydraulic pressure. The landing gear down lockpins should start to retract. They should be fully retracted when the pressure reaches 12-18