# NTSB FTW79FPA26: Piper PA-23, N3036P, Addison, TX, August 21, 1979

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: August 21, 1979
- Place: Addison, TX · ADDISON, TX
- Location: 32.9637° N, 96.8338° W: Placed by OpenAirDocs: center of Addison, TX, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=32.9637&lon=-96.8338&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report October 18, 1979
- Report: Brief approved by the director
- NTSB case key (mKey): 134784
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW79FPA26
- Page: https://openairdocs.org/ntsb/FTW79FPA26

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2136  79/8/21    ADDISON,TX          PIPER PA-23         CR-  0  0  2  INSTRUCTIONAL             COMMERCIAL, FL.INSTR.,
        TIME - 1400                    N3036P              PX-  0  0  0  DUAL                      AGE 24, 1445 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            46 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        NAME OF AIRPORT - ADDISON
        DEPARTURE POINT             INTENDED DESTINATION
          DALLAS,TX                   ADDISON,TX
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           WHEELS-UP                                                LANDING: LEVEL OFF/TOUCHDOWN
        PROBABLE CAUSE(S)
           AIRFRAME - LANDING GEAR: NORMAL RETRACTION/EXTENSION ASSEMBLY
           AIRFRAME - LANDING GEAR: EMERGENCY/EXTENSION ASSEMBLY
           SYSTEMS - HYDRAULIC SYSTEM: RELIEF VALVE
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
        REMARKS- MALFUNCTION OF THERMAL RELIEF VALVE IN HYDR PWR-PAC.
```

## Aircraft

- Registration: [N3036P](https://openairdocs.org/deregistered/N3036P-1981-03-13), registration cancelled 1981-03-13, S/N 23-947, built 1957 (OpenAirDocs)
- Reported make and model: PIPER PA-23
- Registry model: [Piper PA-23](https://openairdocs.org/model/piper-pa-23) (registry code 7102302) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Addison

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19790821025459A](https://openairdocs.org/incident/19790821025459A), Aug 21, 1979: Piper PA23, Addison, TX, Substantial damage. Nose gear collapsed on landing. Found defective thermal hydraulic relief valve.

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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