Section III. OPERATING INSTRUCTIONS - TM-55-4920-424-13-P0022

TM 55-4920-424-13&P

SECTION III

OPERATING INSTRUCTIONS

3-1.

GENERAL.

3-2. The Mobile Check Stand is a control unit providing a mounting platform, electrical controls, and components

necessary for operating the models T-62T-2A and T-62T-2A1 auxiliary power units. The check stand, independent of the

APU, cannot be turned on or off. Its components function only as a part of the power unit. The starting and stopping

procedures given in this section are for the purpose of operating the auxiliary power unit, either for testing the APU, for

furnishing external ac power to the aircraft or for charging the battery.

3-3.

MOUNTING THE APU ON THE CHECK STAND.

CAUTION

Place removed APU components in a safe place to prevent loss. These parts will

be reinstalled on APU after removal of unit from check stand.

3-4. To mount the APU on the check stand, remove the thermocouple boss cap.

Refer to TM 55-2835-203-24 for

removal procedures for this APU component.

a. Preparation.

(1) Position check stand and set hand brake (pull brake handle up).

(2) Prepare stand, battery, speed increaser, and fuel system for use.

Refer to Section II for preparation

procedures.

(3) Remove metal cover from pa d on speed increaser. Save nuts and washers for use in attaching APU to

speed increaser.

(4) Check APU output shaft spline drive adapter on speed increaser for damage. Wipe clean if necessary.

b. Mounting the APU. (See figures 3-1 and 5-1. )

Note

A support for the aft section of the APU is provided on the forward section of the

trailer. Carefully rest APU on this support while engaging spline drive adapter.

3-1