# Incident 20210504005239I: Aerovodochody L-29 DELFIN, Hollister, CA, May 4, 2021

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: May 4, 2021, 16:23 local time
- Place: Hollister, CA
- Airport: Hollister Municipal
- Damage: Minor damage
- Phase of flight: Landing: Approach
- Operating rules: General operating rules (Part 91)
- Location: 36.8933° N, 121.4103° W: Placed by OpenAirDocs at HOLLISTER MUNI (CVH), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=36.8933&lon=-121.4103&mi=10
- Aircraft: N129MR, registered now (https://openairdocs.org/aircraft/N129MR) (OpenAirDocs)
- Registry model: Aerovodochody L-29 DELFIN (registry code 0564310, https://openairdocs.org/model/aerovodochody-l-29-delfin) (OpenAirDocs)
- Registry engine: Motorlet M-701C (registry code 46000, https://openairdocs.org/engine/motorlet-m-701c) (OpenAirDocs)
- Reported make and model: AEROVODOCHODY L-29 DELFIN
- Reported engine: MOTORLET M-701C
- People aboard: 1
- Fatal injuries: 0
- Other injuries: 0
- Pilot certificates: Airline transport, commercial pilot, flight instructor
- Pilot flight hours: 22,000 total, 120 in this make and model, 210 in the last 90 days
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20210504005239I

## Narrative

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

THE LANDING GEAR DID NOT COME DOWN. THE MAIN HYDRAULIC PRESSURE HOSE OF THE L-29 FAILED WHEN THE HOSE BROKE OFF IN THE HOSE FITTING. THE RESULT WAS THE NORMAL HYDRAULIC SYSTEM DEPRESSURIZED. THE EMERGENCY EXTENSION OF THE LANDING GEAR REQUIRES TO TIE INTO THE NORMAL HYDRAULIC SYSTEM BY WAY OF A MANUAL VALVE. BECAUSE THE TWO SYSTEMS ARE INTERCONNECTED, AND THE NORMAL SIDE WAS OPEN TO THE ATMOSPHERE, THE EMERGENCY HYDRAULIC SYSTEM ACCUMULATOR PUSHED ANY AVAILABLE FLUID OUT THE COMPROMISED OPENING. THE RESULT OF THE BROKEN PRESSURE HOSE WAS THE FAILURE OF THE LANDING GEAR TO GO DOWN AND LOCKED.

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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