# Accident 20170923019759A: Sc Aerostar Sa YAK-52W, El Cajon, CA, September 23, 2017

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: September 23, 2017, 14:30 local time
- Place: El Cajon, CA
- Airport: Gillespie Field
- Damage: Substantial damage
- Phase of flight: Taxi
- Operating rules: General operating rules (Part 91)
- Location: 32.8261° N, 116.9725° W: From the FAA
- Nearby events: https://openairdocs.org/map.md?lat=32.8261&lon=-116.9725&mi=10
- Aircraft: N52KF, registered now (https://openairdocs.org/aircraft/N52KF) (OpenAirDocs)
- Registry model: SC Aerostar YAK-52W (registry code 05607AN, https://openairdocs.org/model/sc-aerostar-yak-52w) (OpenAirDocs)
- Registry engine: Amateur-built UNKNOWN ENG (registry code 99999, https://openairdocs.org/engine/amateur-built-unknown-eng) (OpenAirDocs)
- Reported make and model: SC AEROSTAR SA YAK-52W
- Reported engine: AMA/EXPR UNKNOWN ENG
- People aboard: 2
- Fatal injuries: 0
- Other injuries: 0
- Pilot certificates: Airline transport, flight instructor
- Pilot flight hours: 6,500 total, 11 in this make and model, 9 in the last 90 days
- NTSB investigation: [NTSB WPR17LA214](https://openairdocs.org/ntsb/WPR17LA214) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20170923019759A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

PILOT WAS UNABLE TO START THE ENGINE DUE TO REQUIRED CHARGE OF THE PNEUMATIC SYSTEM. AFTER REQUESTING EXTERNAL SERVICING THE PILOT CLOSED THE COMPRESSED AIR SUPPLY VALVE WHICH IS A REQUIRED STEP. THIS IS TO INSURE AGAINST OVER PRESSURIZING  OF THE PNEUMATIC SYSTEM. MECHANIC WITH THE EXTERNAL AIR TANK DID NOT BRING THE CORRECT ADAPTER AND LEFT TO FIND ANOTHER ONE. AT THIS TIME A SECOND MECHANIC ARRIVED AND OFFERED TO HAND START THE ENGINE. THE ENGINE WAS STARTED SUCCESSFULLY FOLLOWED BY A POST START CHECK LIST. WHILE TRAVELING ON TAXIWAY DELTA THE AIRCRAFT BEGAN  TO EXPERIANCE BRAKE LOSS. IMMEDIATELY UPON REALIZING THE COMRESSED AIR SUPPLY VALVE WAS STILL IN THE CLOSED POSITION THE PILOT ATTEMPTED TO OPEN THE VALVE BUT DID NOT HAVE ENOUGH TIME BEFORE THE AIRCRAFT IMPACTED THE FENCE.

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB WPR17LA214](https://openairdocs.org/ntsb/WPR17LA214), Sep 23, 2017: SC Aerostar YAK 52W (N52KF), El Cajon, CA, substantial damage. Probable cause: The pilot's failure to maintain directional control during taxi after a reduction in braking performance and steering capabilities due to his failure to reopen the air supply valve after the…

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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