Accident Mooney M22 Mustang HB-DVY, Friday 3 January 2020
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Date:Friday 3 January 2020
Time:13:22 LT
Type:Mooney M22 Mustang
Registration: HB-DVY
MSN: 690004
Year of manufacture:1969
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Minor
Location:Aerodrom Portorož -   Slovenia
Phase: Landing
Departure airport:
Destination airport:Portorož Airport (POW/LJPZ)
Investigating agency: AAIIS
Confidence Rating: Accident investigation report completed and information captured
The plane landed with gear up. No injuries reported.

Due to a fault in the electrical fuse (deterioration), the 10 amp fuse of the undercarriage control had tripped. After moving the undercarriage extension lever, the undercarriage remained in the retracted position. When the engine power control lever is operated to reduce the throttle below 15'' of boost, a warning sound is activated in the form of an intermittent tone. With the engine running and descending with parameters other than normal and using headphones with built-in active noise cancellation (BOSE A20), the pilots did not distinguish the warning sound for the landing gear not extended from the other noise. Since, at the time of landing, the position of the sun was behind the aircraft, it can be assumed that the green LDG indication light was illuminated in the sun, resulting in a misinterpretation of the landing gear indication by both pilots (supported by the position of the landing gear retraction lever).
The landing gear indication light has an intensity adjustment option which is done manually. Even at maximum intensity, the light is less visible during the day.
Weather conditions did not have a significant effect on the incident, but may be considered as contributing to the incident due to the limited visibility at an airport new to the pilot.
On analysis of the ATC voice communication recording, the landing gear warning sound was audible, but there was no time or opportunity for action to prevent the incident by the ATC controller.
After the fault had been rectified, the engine repaired and the propeller replaced, the aircraft was returned to service and the operation of the retractable landing gear was duly certified by the competent maintenance organisation or a licensed technician.

Accident investigation:
Investigating agency: AAIIS
Report number: 
Status: Investigation completed
Download report: Final report



Revision history:

03-Jan-2020 15:48 Vojko Added
03-Jan-2020 15:48 harro Updated [Aircraft type, Total fatalities, Other fatalities, Destination airport]
03-Jan-2020 16:38 Anon. Updated [Aircraft type, Registration, Source]
03-Jan-2020 16:39 harro Updated [Aircraft type, Cn, Operator]
03-Jan-2020 22:11 Iceman 29 Updated [Time, Source, Embed code, Narrative]
18-Jul-2022 19:43 harro Updated [Time, Embed code, Narrative, Accident report]

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