# NTSB ANC75AA004: Aero Comdr 600S2R, N5521X, Umiat, AK, July 9, 1974

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: July 9, 1974
- Place: Umiat, AK · UMIAT, AK
- Location: 69.3669° N, 152.1442° W: Placed by OpenAirDocs: center of Umiat, AK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=69.3669&lon=-152.1442&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report September 18, 1974
- Report: Brief approved by the director
- NTSB case key (mKey): 130218
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC75AA004
- Page: https://openairdocs.org/ntsb/ANC75AA004

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2259   74/7/9  NR.UMIAT,ALAS         AERO COMDR 600S2R   CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 43, 1907
        TIME - UNK/NR                  N5521X              PX-  0  0  0  AIR TAXI-CARGO            TOTAL HOURS, 11 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - UNNAMED STRIP
        DEPARTURE POINT             INTENDED DESTINATION
         UMIAT,ALAS                   LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           GEAR COLLAPSED                                           LANDING: ROLL
           NOSE OVER/DOWN                                           LANDING: ROLL
        PROBABLE CAUSE(S)
           AIRFRAME - LANDING GEAR: MAIN GEAR-SHOCK ABSORBING ASSY,STRUTS,ATTACHMENTS,ETC.
           MISCELLANEOUS ACTS,CONDITIONS - POOR WELD
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION
        REMARKS- HEAVILY LOADED.L GR STRUT FAILED AT OLD WELD.
```

## Aircraft

- Registration: [N5521X](https://openairdocs.org/deregistered/N5521X-2021-10-18), registration cancelled 2021-10-18, S/N 1721R, built 1973 (OpenAirDocs)
- Reported make and model: AERO COMDR 600S2R
- Registry model: [Aero Commander S2R](https://openairdocs.org/model/aero-commander-s2r) (registry code 0143022) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Unnamed Strip

## 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 19740709033179A](https://openairdocs.org/incident/19740709033179A), Jul 9, 1974: Ayres S2R, Umiat, AK, Substantial damage. Heavily loaded.l gr strut failed at old weld.

## Other investigations on N5521X (2)

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.

- [NTSB CEN18LA332](https://openairdocs.org/ntsb/CEN18LA332), Aug 15, 2018: Aero Commander S2R (N5521X), Westbrook, MN, substantial damage. Probable cause: A runway excursion during takeoff for reasons that could not be determined based on the available evidence.
- [NTSB FTW74DPG30](https://openairdocs.org/ntsb/FTW74DPG30), Oct 8, 1973: Aero Comdr S-2R (N5521X), Fisher, AR, destroyed

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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