# NTSB MIA75IM088: Martin 404, N40425, Key West, FL, June 16, 1975

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Closed
- Date: June 16, 1975
- Place: Key West, FL · KEY WEST, FL
- Location: 24.5651° N, 81.7755° W: Placed by OpenAirDocs: center of Key West, FL, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=24.5651&lon=-81.7755&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 17 uninjured
- Status: Completed, report June 24, 1975
- Report: Brief approved by the director
- NTSB case key (mKey): 149058
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA75IM088
- Page: https://openairdocs.org/ntsb/MIA75IM088

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
5-0011  75/6/16    KEY WEST,FL         MARTIN 404          CR-  0  0  3  COMMERCIAL                AIRLINE TRANSPORT, AGE
        TIME - 1015                    N40425              PX-  0  0 14  COMMUTER AIR CARRIER      38, 7500 TOTAL HOURS,
                                       DAMAGE-MINOR        OT-  0  0  0  AIR TAXI-PASSG S-D        2600 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        CLASSIFIED AS INCIDENT
        NAME OF AIRPORT - KEY WEST INTL
        DEPARTURE POINT             INTENDED DESTINATION
          KEY WEST,FL                 MIAMI,FL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           FIRE OR EXPLOSION: IN FLIGHT                             IN FLIGHT: CLIMB TO CRUISE
        PROBABLE CAUSE(S)
           SYSTEMS - HYDRAULIC SYSTEM: RESERVOIR,LINES,FITTINGS
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
        FACTOR(S)
           SYSTEMS - FIRE EXTINGUISHING SYSTEM: POWERPLANT
           MISCELLANEOUS ACTS,CONDITIONS - ERRATIC
           MISCELLANEOUS ACTS,CONDITIONS - FIRE IN ENGINE
        EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING ON AIRPORT
        REMARKS- NR2 ENG HYD PRESS LINE RUPTURED.POST FLT TEST SHOWED SLUGGISH OPERATION OF ENG FIRE EXT SYST.
```

## Aircraft

- Registration: [N40425](https://openairdocs.org/deregistered/N40425-2014-10-06), registration cancelled 2014-10-06, S/N 14131, built 1952 (OpenAirDocs)
- Reported make and model: MARTIN 404
- Registry model: [Martin 404](https://openairdocs.org/model/martin-404) (registry code 5450702) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R-2800 series](https://openairdocs.org/engine/pratt-whitney-r-2800-series) (registry code 52026, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Minor damage
- Airport: Key West Intl

## 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 19750616016199A](https://openairdocs.org/incident/19750616016199A), Jun 16, 1975: Martin 404MARTIN, Key West, FL, Substantial damage. NR2 eng hyd press line ruptured. Post flt test showed sluggish operation of eng fire ext syst.

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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