# NTSB NYC77IA021: Boeing 747, N9664, San Juan, PR, December 12, 1976

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Closed
- Date: December 12, 1976
- Place: San Juan, PR · SAN JUAN, PR
- Location: 18.4663° N, 66.1057° W: Placed by OpenAirDocs: center of San Juan, PR, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=18.4663&lon=-66.1057&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 206 uninjured
- Status: Completed, report March 2, 1977
- Report: Brief approved by the director
- NTSB case key (mKey): 157027
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC77IA021
- Page: https://openairdocs.org/ntsb/NYC77IA021

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
4-0018  76/12/12   SAN JUAN,PR         BOEING 747          CR-  0  0 17  SCHED INTERNATL PASSG SRV AIRLINE TRANSPORT, AGE
        TIME - 1743                    N9664               PX-  0  0189                            UNK/NR, UNK/NR TOTAL
                                       DAMAGE-MINOR        OT-  0  0  0                            HOURS, UNK/NR IN TYPE,
                                                                                                   INSTRUMENT RATED.
        CLASSIFIED AS INCIDENT
        OPERATOR - AMERICAN AIRLINES,INC.
        DEPARTURE POINT             INTENDED DESTINATION
          ARUBA                       JAMAICA,NY
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           AIRFRAME FAILURE: IN FLIGHT                              IN FLIGHT: CLIMB TO CRUISE
        PROBABLE CAUSE(S)
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: IMPROPER MAINTENANCE (MAINTENANCE PERSONNEL)
           SYSTEMS - FLIGHT CONTROL SYSTEMS: WING FLAP CONTROL SYSTEM HYDRAULIC
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
        EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING ON AIRPORT
                                  SUSPECTED MECHANICAL DISCREPANCY
        REMARKS- BOEING SVC BULLETIN NR 747-27-2092 C/W.DRG SOME MAINT PHASE LONGER LINKS WERE RPLCD BY SHORT LINKS
```

## Aircraft

- Registration: N9664 (not matched to a registry record)
- Reported make and model: BOEING 747
- 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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