Navigation Ground Speed Transformer BI Coarse Position

Figure 3. Test setup.

Adjustment No. 1.

8. Navigation Ground Speed Transformer BI Coarse

Position. a. Performance Check.

(1) Disassemble dial lock (fig. 1) and turn

NAVIGATION GROUND SPEED dial (five revolution

(1) Be sure NAVIGATION GROUND SPEED dial

maximum) to obtain maximum indication on electronic

(fig. 1) of unit under test is secured to shaft of

voltmeter.

transformer B1 (fig. 4).

(2)

Reassemble dial lock.

(2) Install jumper wires between terminals C and

J, A and E, and A and H of barrier strip (fig. 2).

c. Adjustment No. 2.

(3) Connect electronic voltmeter to terminals C

(1) Set NAVIGATION GROUND SPEED dial at

and F of barrier strip with test leads.

225 and lock dial at this setting with dial lock (fig. 1).

(4)

Energize 115 vac, 400 Hz primary power

(2) Refer to figure 4. Loosen the three clamp

circuit.

screws that secure case of transformer B1.

(5) Observe electronic voltmeter and carefully set

(3) Observe electronic voltmeter and slowly turn

NAVIGATION GROUND SPEED dial for maximum

transformer case for maximum indication on electronic

indication on electronic voltmeter. If maximum indication

voltmeter.

cannot be obtained, perform adjustment No. 1 in b

below.

(4) Tighten the three clamp screws that secure

case of transformer B1.

(6) Check NAVIGATION GROUND SPEED dial

indication. The dial indication should be 225 10. If dial

indication is incorrect perform adjustment No. 2 in c

below.