# NTSB ANC82DA005: Cessna 170B, N4640C, Missing Aircraft, October 22, 1981

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: October 22, 1981
- Place: Missing Aircraft · MISSING AIRCRAFT, UN
- Phase of flight: [Unknown](https://openairdocs.org/ntsb-phases/990) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 1 fatal
- Status: Completed, report June 26, 1982
- Report: Brief approved by the director
- NTSB case key (mKey): 122749
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC82DA005
- Page: https://openairdocs.org/ntsb/ANC82DA005

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3672  81/10/22   MISSING AIRCRAFT    CESSNA 170B         CR-  1  0  0  NONCOMMERCIAL             COMMERCIAL, AGE 31,
        TIME - UNK/NR                  N4640C              PX-  0  0  0  PLEASURE/PERSONAL TRANSP  UNK/NR TOTAL HOURS,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            UNK/NR IN TYPE,
                                                                                                   INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          ANCHORAGE,AK                MCGRATH,AK
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           MISSING AIRCRAFT,NOT RECOVERED                           UNKNOWN/NOT REPORTED
        PROBABLE CAUSE(S)
           MISCELLANEOUS - UNDETERMINED
        REMARKS- DAMAGE AND INJURY INDEX PRESUMED.LOW CIG & ICG CONDS ALONG PLANNED ROUTE OF FLT.
```

## Aircraft

- Registration: [N4640C](https://openairdocs.org/deregistered/N4640C-1982-11-12), registration cancelled 1982-11-12, S/N 25584, built 1953 (OpenAirDocs)
- Reported make and model: CESSNA 170B
- Registry model: [Cessna 170B](https://openairdocs.org/model/cessna-170b) (registry code 2072306) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Destroyed

## 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 19811022071669A](https://openairdocs.org/incident/19811022071669A), Oct 22, 1981: Cessna 170B, AK, Destroyed. Became missing after departing on a VFR on top flight plan. Low clouds icing. Tops 15000 en route. Mountain terrain

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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