# NTSB DIA69A0051: Piper PA-31, N9121Y, Wilmington, DE, March 27, 1969

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: March 27, 1969
- Place: Wilmington, DE · WILMINGTON, DE
- Location: 39.7357° N, 75.5321° W: Placed by OpenAirDocs: center of Wilmington, DE, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=39.7357&lon=-75.5321&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report April 25, 1969
- Report: Brief approved by the director
- NTSB case key (mKey): 191354
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DIA69A0051
- Page: https://openairdocs.org/ntsb/DIA69A0051

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0141  69/3/27    WILMINGTON,DEL      PIPER PA-31         CR-  0  0  1  COMMERCIAL                COMMERCIAL, FL.INSTR.,
        TIME - 0936                    N9121Y              PX-  0  0  1  COMMUTER AIR CARRIER      AGE 41, 1700 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0  AIR TAXI-PASSG S-D        400 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - WILMINGTON
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           WHEELS-UP                                                LANDING: LEVEL OFF/TOUCHDOWN
        PROBABLE CAUSE(S)
           AIRFRAME - LANDING GEAR: NORMAL RETRACTION/EXTENSION ASSEMBLY
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
           MISCELLANEOUS ACTS,CONDITIONS - HYDRAULIC FAILURE
           MISCELLANEOUS ACTS,CONDITIONS - PRESSURE,NONE
           MISCELLANEOUS ACTS,CONDITIONS - LEAK/LEAKAGE
        EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING ON AIRPORT
                                  SUSPECTED MECHANICAL DISCREPANCY
        REMARKS- DAMAGED O RING ALLOWED HYDRAULIC FLUID TO LEAK OUT OF SYSTEM.
```

## Aircraft

- Registration: [N9121Y](https://openairdocs.org/deregistered/N9121Y-2013-03-18), registration cancelled 2013-03-18, S/N 31-161, built 1968 (OpenAirDocs)
- Reported make and model: PIPER PA-31
- Registry model: [Piper PA-31-310](https://openairdocs.org/model/piper-pa-31-310) (registry code 7103102) (OpenAirDocs)
- Registry engine: [Lycoming TI0-540 series](https://openairdocs.org/engine/lycoming-ti0-540-series) (registry code 41533, turbo-prop) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Wilmington

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.

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