Flight Crew Instrument; Flight Crew Flight Instructor; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 90; Flight Crew Total 7500; Flight Crew Type 3500
Workload; Distraction; Situational Awareness; Troubleshooting
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural FAR
General None Reported / Taken
Aircraft
While performing a practice ILS to Runway 1L at ADW; the Radar Altimeter sweep twice to 250 ft. The practiced ILS was performed coupled and had engaged at the final approach fix. The sweep occurred approximately 3.5 miles from the end of the runway. The helicopter was about 1000 ft. AGL then swept down to 250 ft. AGL. Stabilized for a second then returned to the correct altitude. Then it swept a second time. This sweep of the Radar Altimeter did not effect the helicopter controls.
Helicopter Instructor Pilot reported the Radio Altimeter swept twice from the aircraft's altitude to 250 ft. AGL and back again while on final approach.