SECTION II. EQUIPMENT REQUIREMENTS - TB-11-6625-928-350002

DEPARTMENT OF THE ARMY TECHNICAL BULLETIN - TB-11-6625-928-350001

SECTION III. PRELIMINARY OPERATIONS - TB-11-6625-928-350003

TB-11-6625-928-35 Calibration Procedures for Test Facilities Kit MK-994/AR Manual
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2

NOTE

Table 1. Calibration Description - Continued

Heading-Radio Bearing Indicator ID-1351(*) is

Performance specifications

TI parameters

adjusted, repaired, and aligned at depot avionics

XMTR No. 1 at 0

Radio bearing pointer

maintenance shops only. Under no circum-

Radio bearing pointer at S, ADF

stances will the personnel performing the

pointer tracks XMTR 2

Mechanical alignment: When unit

Steering indicator (M1)

calibration break the seal on the ID-1351(*).

is horizontal M1 is aligned with

a. Model Variations. ID-1351(*) refers to

center dot

ID-1351/A, ID-1351A/A or ID-1351B/A. Externally all

Electrical alignment: With 7520

models of ID-1351(*) are the same. Calibration of all

amps M1 indicates at first

models is identical,

dot. With 150 12 amps M1

is aligned with 2nd dot.

b. Time and Technique. The time required for this

Mechanical alignment: When unit

Station approach indicator (M2)

calibration is approximately 3 hours, using the technique

is horizontal M2 aligns with up-

described herein.

per dot

2. Calibration Data Card (DA Form 2416). Forms,

Electrical alignment: With 7520

records, and reports required for calibration personnel at

amps M2 indicates at center

of first dot, with 15012

all levels are prescribed by TM 38-750. DA Form 2416

amps M2 indicates center of

must be annotated in accordance with TM 38-750 for

second dot.

each calibration performed.

Signal strength meter (M3)

All black indication: With 22 or

3. Calibration Description. TI parameters and perform-

less volts applied

ance specifications which pertain to this calibration are

Alternate black and white indica-

listed in table 1.

tion: With 0.5 volt applied.

As M4 just starts to move out of

Power warning indicator (M4)

Table 1. Calibration Description

position multimeter should in-

dicate 20 or more volts. With

M4 fully out of sight

multimeter indicates 36 volts

SECTION II. EQUIPMENT REQUIREMENTS

meet or exceed the minimum use specifications listed in

4. Equipment Required. Table 2 identifies the specific

table 2. The accuracies listed in table 2 provide a four to

equipment used in this calibration procedure. This equip-

one ratio between the standard and the TI.

ment is available in avionics repair facilities, and is to be

5. Accessories Required. The accessories required in ta-

used in performing this procedure. Alternate items may

ble 2 are issued as indicated in paragraph 4 above and are

be used by the calibrating activity when the equipment

to be used in this calibration procedure when necessary.

listed in table 2 is not available. The items selected must

These items may be substituted by equivalent items unless

be verified to perform satisfactorily prior to use and must

specifically prohibited.

bear evidence of current calibration. The equipment must

Table 2. Minimum Specifications of Equipment Required

Manufacturer, model,

Minimum use

and part number

Item

Common name

specifications

Simulator, Gyro Compass, signal SM-486/ASN,

Must provide 2 independent synchro transmitter

GYRO SIGNAL SIMULA-

TOR

outputs, three-wire synchro type, adjustable

with correction chart.

through 360 and set table to 1 minute of arc.

VOLTMETER

Range: 0 to 26 Vac

Multimeter ME-30/U

Accuracy: 5%

Range volts 0-40 Vdc

Multimeter AN/USM-223

MULTIMETER

amperes, 0-230 a

ohms, 0-100 k ohms

Accuracy: 5%

Power supply PP-4838/U

POWER SUPPLY

Range: volts, 0-40 Vdc

amperes, 0-230 a

Accuracy: N/A

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