SECTION I IDENTIFICATION AND DESCRIPTION

TB 9-4920-361-24

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Xmsn oil temp.......................................................

Rotor speed ...........................................................

Engine % rpm No. 1 and No. 2 ............................

Gas gen speed No. 1 and No. 2 ............................

Engine oil press No. 1 and No. 2 .........................

Xmsn oil press ......................................................

Inter cal (unit tester)............................................

Rotor overspeed (unit tester)...............................

Central display and signal data (unit tester).....

Display update (unit tester) ................................

Power supply ........................................................

Final procedure ....................................................

IDENTIFICATION AND DESCRIPTION

1. Test Instrument Identification.

This bulletin provides instructions for the

calibration of Vertical Display System Line Test Set, Canadian Marconi, Model 476-853 and

Vertical Display System Bench Test Set, Canadian Marconi, Model 476-854. TM 55-4920-

413-13&P and TM 55-4920-412-13&P were used as the prime data sources in compiling

these instructions. The equipment being calibrated will be referred to as the TI (test

instrument) throughout this bulletin.

a. Model Variations. Model 476-854 contains a simulator and a unit tester. Model

476-853 contains only a simulator.

b. Time and Technique. The time required for this calibration is approximately 3

hours, using the dc and low frequency technique.

2. Forms, Records, and Reports

a. Forms, records, and reports required for calibration personnel at all levels are

prescribed by TB 750-25.

b. Adjustments to be reported are designated (R) at the end of the sentence in which

they appear. When adjustments are in tables, the (R) follows the designated adjustment.

Report only those adjustments made and designated with (R).

3. Calibration Description. TI parameters and performance specifications which

pertain to this calibration are listed in table 1.

Table 1. Calibration Description

Test instrument parameters

Performance specifications

MODEL 476-853

Torque No. 1 and No. 2 (simulator)

Fixed: 0 and 3.7 V dc

Accuracy: ±0.10 V dc

Variable: 0 ±0.10 to 5.42 V dc min

Fuel quantity No. 1 and No. 2 (simulator)

Fixed: 0 and 6.13 V dc

Accuracy: ±0.05 V dc

Variable: 0 ±0.10 to 7.63 V dc min