# NTSB DEN78FTC35: Dyke Delta JD11, N99DD, Ft.Bridger, WY, August 5, 1978

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: August 5, 1978
- Place: Ft.Bridger, WY · FT.BRIDGER, WY
- Location: 41.3183° N, 110.3894° W: Placed by OpenAirDocs: center of Fort Bridger, WY, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.3183&lon=-110.3894&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious, 1 uninjured
- Status: Completed, report October 12, 1978
- Report: Brief approved by the director
- NTSB case key (mKey): 139701
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN78FTC35
- Page: https://openairdocs.org/ntsb/DEN78FTC35

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2688   78/8/5    FT.BRIDGER,WY       DYKE DELTA JD11     CR-  0  1  0  NONCOMMERCIAL             PRIVATE, AGE 47, 1395
        TIME - 1145                    N99DD               PX-  0  0  1  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 71 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          CHEYENNE,WY                 OGDEN,UT
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: NORMAL CRUISE
           WHEELS-UP                                                LANDING: ROLL
        PROBABLE CAUSE(S)
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION
           POWERPLANT - EXHAUST SYSTEM: STACKS
           MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE
        FACTOR(S)
           TERRAIN - ROUGH/UNEVEN
        PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- EXHAUST MUFF BROKE LOOSE FROM FATIQUE ALLOWING HOT GAS TO ESCAPE AGAINST FIREWALL.
```

## Aircraft

- Registration: [N99DD](https://openairdocs.org/deregistered/N99DD-2009-09-18), registration cancelled 2009-09-18, S/N DR-1, built 1978 (OpenAirDocs)
- Reported make and model: DYKE DELTA JD11
- Registry model: [Radford DYKE DELTA JD II](https://openairdocs.org/model/radford-dyke-delta-jd-ii) (registry code 0566502) (OpenAirDocs)
- Registry engine: [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series) (registry code 41514, reciprocating) (OpenAirDocs)
- Category: Airplane, amateur-built
- Engines: reciprocating
- Damage: Substantial 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).

- [Accident 19780805023819A](https://openairdocs.org/incident/19780805023819A), Aug 5, 1978: Amtr 0566502, Ft.Bridger, WY, Substantial damage. Exhaust muff broke loose from fatique allowing hot gas to escape nst firewall.

## Other investigations on N99DD (1)

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 DEN80FTE12](https://openairdocs.org/ntsb/DEN80FTE12), Dec 13, 1979: Delta Dyke (N99DD), Broomfield, CO, substantial damage, 2 fatal

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.