97-20 Radar Altimeter Installation (continued)
E. Antenna
Refer to § 6-80 for antenna locations & R66 Illustrated Parts Catalog (IPC) Chapter 6.
Removal
1. Turn battery & avionics switches off and pull out RADAR ALT (2 amp) circuit
breaker on circuit breaker panel.
2. Remove hardware securing F469 scuff plate and carpet assembly to floor,
remove plate, and peel back carpet as required. Remove hole plug.
3. Disconnect antenna cable from antenna.
4. Remove screws securing antenna to chin. Repeat steps for opposite-side
antenna.
Installation
1. Turn battery & avionics switches off and pull out RADAR ALT (2 amp) circuit
breaker on circuit breaker panel.
2. Connect antenna cable to antenna and install screws securing antenna to chin.
Verify security.
3. Install floor hole plug. Install hardware securing F469 scuff plate and carpet
assembly to floor. Repeat steps for opposite-side antenna.
4. Push in RADAR ALT (2 amp) circuit breaker on circuit breaker panel. Turn
battery & avionics switches on.
5. Perform appropriate functional checks per Freeflight Systems Instructions for
Continued Airworthiness. Turn battery & avionics switches off.
F. Scheduled Maintenance and Inspections
Refer to Freeflight Systems Instructions for Continued Airworthiness.
G. Special Maintenance and Inspections
1. Turn battery & avionics switches off. Open circuit breaker panel. Open instrument
console, remove perimeter screws securing instrument face to upper console, or remove
Garmin GDU 620 Display per § 95-70. Hinge front left seat forward as required.
2. Inspect condition of and verify no obvious damage to RAD-40 Indicator, ATG-
410 Tone Generator, RA-4000/RA-4500 Radar Altimeter, copper bus bars, circuit
breaker, and wiring. Verify no loose, chafed, or broken wires or terminals. Verify
no evidence of arcing. Verify equipment security.
3. Secure circuit breaker panel and close instrument console, install perimeter screws
securing instrument face to upper console, or install Garmin GDU 620 Display per
§ 95-70. Hinge front left seat aft as required.
APR 2019 Chapter 97 Avionics Page 97.11
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