# NTSB IAD78IA075: Boeing 737, N9047U, Elmira, NY, June 30, 1978

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Closed
- Date: June 30, 1978
- Place: Elmira, NY · ELMIRA, NY
- Location: 42.0934° N, 76.8096° W: Placed by OpenAirDocs: center of Elmira, NY, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=42.0934&lon=-76.8096&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 109 uninjured
- Status: Completed, report September 28, 1978
- Report: Brief approved by the director
- NTSB case key (mKey): 140517
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=IAD78IA075
- Page: https://openairdocs.org/ntsb/IAD78IA075

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
4-0010  78/6/30  NR.ELMIRA,NY          BOEING 737          CR-  0  0  6  SCHED DOM PASSG SRV       AIRLINE TRANSPORT, AGE
        TIME - 1928                    N9047U              PX-  0  0103                            UNK/NR, 11564 TOTAL
                                       DAMAGE-NONE         OT-  0  0  0                            HOURS, 799 IN TYPE,
                                                                                                   INSTRUMENT RATED.
        CLASSIFIED AS INCIDENT
        OPERATOR - UNITED AIR LINES,INC.
        DEPARTURE POINT             INTENDED DESTINATION
          CLEVELAND,OH                BOSTON,MA
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           MISCELLANEOUS                                            IN FLIGHT: CLIMB TO CRUISE
        PROBABLE CAUSE(S)
           SYSTEMS - HYDRAULIC SYSTEM: HYDRAULIC PUMPS
           SYSTEMS - HYDRAULIC SYSTEM: SEALS
           COPILOT - SPONTANEOUS-IMPROPER ACTION
           PILOT IN COMMAND - FAILED TO FOLLOW APPROVED PROCEDURES,DIRECTIVES,ETC.
           PILOT IN COMMAND - INADEQUATE SUPERVISION OF FLIGHT
           MISCELLANEOUS ACTS,CONDITIONS - CREW COORDINATION-POOR
        REMARKS- LOST A&B HYD SYSTEMS.DIVERT TO IAD.NR 1 ENG A SYS PUMP SHAFT SEAL FAILED.F/O SECURED B SYS PUMPS.
```

## Aircraft

- Registration: N9047U (not matched to a registry record)
- Reported make and model: BOEING 737
- Category: Airplane
- Engines: turbo fan
- Damage: No damage

## FAA reports on this event (1)

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

- [Incident 19780630034489I](https://openairdocs.org/incident/19780630034489I), Jun 30, 1978: Boeing 737222, Washington, DC. "A" hydraulic system failed due to loose b nut and pump failure. Landed safely.

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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