SUPPLEMENT SG-3
CHAPTER 31 - INDICATIONG SYSTEM
GDC 74A (ADC) REMOVAL/INSTALLATION
Removal
1. Disconnect the pitot/static plumbing from the rear of the unit. Disconnect the single
connector.
2. Loosen each thumbscrew on the hold‐down clamp and remove the clamp.
3. Carefully remove the unit from its mount.
Replacement
1. Place the unit in the mounting tray.
2. Position the locking clamp and fasten using the thumbscrews.
3. Connect the Pitot/static plumbing.
4. Inspect the connector and pins for damage. Repair any damage.
5. Connect the connector to the unit, ensuring that each slide lock is secured on both sides.
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