# NTSB FTW74IF077: Boeing 727, N4736, Sierra Blanca, TX, April 30, 1974

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Closed
- Date: April 30, 1974
- Place: Sierra Blanca, TX · SIERRA BLANCA, TX
- Location: 31.1834° N, 105.3395° W: Placed by OpenAirDocs: center of Sierra Blanca, TX, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=31.1834&lon=-105.3395&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 97 uninjured
- Status: Completed, report October 24, 1974
- Report: Brief approved by the director
- Safety recommendations: Yes
- NTSB case key (mKey): 79459
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW74IF077
- Page: https://openairdocs.org/ntsb/FTW74IF077

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
4-0007  74/4/30  NR.SIERRA BLANCA,TEX  BOEING 727          CR-  0  0  8  SCHED DOM PASSG SRV       AIRLINE TRANSPORT, AGE
        TIME - 1710                    N4736               PX-  0  0 89                            53, 13429 TOTAL HOURS,
                                       DAMAGE-MINOR        OT-  0  0  0                            4002 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        CLASSIFIED AS INCIDENT
        OPERATOR - NATIONAL AIRLINES,INC
        DEPARTURE POINT             INTENDED DESTINATION         LAST ENROUTE STOP
          SAN DIEGO,CALIF             MIAMI,FLA                    NEW ORLEANS,LA
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: NORMAL CRUISE
           ENGINE TEARAWAY                                          IN FLIGHT: NORMAL CRUISE
        PROBABLE CAUSE(S)
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: IMPROPERLY SERVICED AIRCRAFT (GROUND CREW)
           INSTRUMENTS/EQUIPMENT AND ACCESSORIES - MISCELLANEOUS EQUIPMENT: OTHER
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPERLY SECURED
           MISCELLANEOUS ACTS,CONDITIONS - LEAK/LEAKAGE
           POWERPLANT - MISCELLANEOUS: FOREIGN OBJECT DAMAGE
           POWERPLANT - ENGINE STRUCTURE: MOUNT AND VIBRATION ISOLATORS
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING ON AIRPORT
                                  SUSPECTED OR KNOWN AIRCRAFT DAMAGE
        REMARKS- FLUID LK FM R FWD LAV TANK DRAIN DONUT PLUG.IMPACT DMG R LDG LT,HUMAN WASTE ON #3 ENG NOSE CONE.
```

## Aircraft

- Registration: [N4736](https://openairdocs.org/deregistered/N4736-2013-07-11), registration cancelled 2013-07-11, S/N 19456, built 1968 (OpenAirDocs)
- Reported make and model: BOEING 727
- Registry model: [Boeing 727-235](https://openairdocs.org/model/boeing-727-235) (registry code 138408B) (OpenAirDocs)
- Registry engine: [Pratt & Whitney JT8D-1](https://openairdocs.org/engine/pratt-whitney-jt8d-1) (registry code 52044, turbo-jet) (OpenAirDocs)
- Category: Airplane
- Engines: turbo fan
- Damage: Minor damage

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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