Aerospatiale AS-355F-1 N5796T
18 June 1986 · Galveston, Texas, United States · No injuries
Summary
On 18 June 1986 at about 15:55 local time, a Aerospatiale AS-355F-1 registered N5796T was involved in an accident near Galveston, Texas, United States. One person was on board and nobody was injured. The aircraft was substantially damaged. No probable cause statement is available for this record.
The record
- Date
- at 15:55
- Classification
- Accident
- Location
- Galveston, Texas, United States
- Nearest airport
- High Island 571 Platform
- Coordinates
- 29.3006, -94.7896
- Aircraft
- Aerospatiale AS-355F-1
- Registration
- N5796T
- Category
- Helicopter
- Engines
- 1
- Operator
- Not recorded
- Operating rule
- Part 91: General Aviation
- Purpose of flight
- Positioning
- Phase of flight
- Not recorded
- Route
- High Island 571 → Unknown
- Aircraft damage
- Substantial
- Weather
- VMC
- Light
- Day
- NTSB number
- LAX86MA268
People
Nobody was injured.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 1 | 0 | 0 | 0 | 1 |
Probable cause
The NTSB has not published a probable cause for this record. No probable cause statement is present in the source data.
Nothing about the cause is stated here that is not in the source record.
Read the full NTSB narrative
THE PLT RPRTD THAT WHILE APCHG AN OIL DRILLING PLATFORM FOR A LNDG, HE OBSERVED THE MAIN ROTOR BLADES GO OUT OF TRACK ABOUT 8 TO 10 INCHES. HE ALSO RPRTD THE HELICOPTER DEVELOPED A 1:1 VERTICAL VIBRATION. DRG THE LNDG, THE HELICOPTER ENTERED INTO GROUND RESONANCE & THE PLT IMMEDIATELY SHUT DOWN BOTH ENGINES. AN EXAM OF THE HELICOPTER REVEALED THE LEFT FORWARD TRANSMISSION SUPPORT BAR (TSB) WAS BUCKLED & CRACKED AT MIDSPAN. A METALLURGICAL EXAM OF THE FRACTURE AREA ON THE TSB REVEALED EXTENSIVE, LOW CYCLE, HIGH AMPLITUDE, FATIGUE CRACKING. THERE WAS EVIDENCE THAT THE PROPAGATION TIME OFTHE FATIGUE OCCURRED OVR ABOUT 5 HRS OF OPN. THE INV DID NOT REVEAL WHEN THE ORIGINAL BUCKLING OF THE TSB OCCURRED. NO HISTORY OF A PREV HARD LNDG OR GND REASONANCE WAS FND. ALSO, THE RED ARM OF THE STARFLEX HAD FAILED; AN EXAM INDCD IT HAD RUPTURED EITHER UNDER STATIC LOADS, OR VERY RAPIDLY UNDER HI DYNAMIC LOADS. WHEN TESTED, EXTN & RETRACTION TIMES OF LNDG GEAR DAMPERS WERE 8.34 TO 10.38 SEC; AFTER ACDNT, TIME LMTS ESTABLISHED AT 6 TO 13 SEC, PREVIOUSLY 11.1 TO 13.1 SEC
Quoted verbatim from the NTSB record.
Other Aerospatiale AS-355F accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 31 May 1986 | Aerospatiale AS-355F-1 | Kameula, Hawaii, United States | Hemmeter Aviation, Inc. | Minor injuries | - |
| 18 Jul 1986 | Aerospatiale AS-355F-1 | Morgan City, Louisiana, United States | Mobil Oil Corp. | No injuries | - |
| 4 Feb 1985 | Aerospatiale AS 355F-1 | Sabine Pass, Texas, United States | - | No injuries | - |
| 4 Aug 1985 | Aerospatiale AS-355F | Chamblee, Georgia, United States | - | Serious injuries | - |
| 19 Aug 1987 | Aerospatiale AS-355F-1 | Ship Shoal 214C | - | Serious injuries | - |
| 4 Jan 1984 | Aerospatiale AS-355F | Morgan City, Louisiana, United States | - | Fatal | 2 |
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 17 Aug 1986 | Cessna U206F | Matagorda Is., Texas, United States | Systems Plumbing, Inc. | Minor injuries | - |
| 20 Aug 1986 | Hughes 369-500D | Fort Stockton, Texas, United States | William O. Bowers | No injuries | - |
| 25 Aug 1986 | Cessna 172A | Gainesville, Texas, United States | Michael D. Allison | No injuries | - |
| 29 Aug 1986 | Boeing A75N1 | Addison, Texas, United States | - | No injuries | - |
| 1 Sep 1986 | Boeing A75N1 | Laporte, Texas, United States | - | No injuries | - |
| 2 Sep 1986 | Boeing E75 | Sweetwater, Texas, United States | - | No injuries | - |