Section III. NAVIGATION SYSTEM EVALUATION PROCEDURE

Section III. NAVIGATION SYSTEM EVALUATION PROCEDURE

breakers so that power is available to operate the equipment. Perform the

Evaluation Requirements. a. Aircraft Placement. Have the aircraft

tests from each position in turn to insure a complete check of the navigation

placed in a location that is clear of obstructions such as large buildings,

facilities.

hangars. powerlines. and other aircraft.

b. Power Application.

CAUTION

(1) Auxiliary power. For those tests not requiring flight of the

aircraft. items 15 thru 17 and 19 thru 22 use external power or the aircraft

Navigation equipments require a 3-minute warmup prior to

auxiliary power unit.

operation.

(2) Aircraft power. Tests given in items 18. 23. and 24 require

Procedure. a. All information will be determined by actual

the use of aircraft engines For those items. use qualified personnel to

operate the aircraft. Refer to TM 55-152()-209-10 for CH-47A helicopters.

inspection and operation of the equipment. Evaluate each item listed and

Refer to TM 55-1520-22710 for CH-47B and CH-47C helicopters.

record the proper color rating on DA Form 2404 as described in Section I. All

c. Controls. Before beginning the tests, set the navigation equipment

operator/crew preventive maintenance checks and services shall be

controls to their normal OFF positions. Set the aircraft ac and dc circuit

performed prior to evaluation.

TM 11-1520-209-ESC