# Incident 19950918044039I: Bolkms BO105C, Lafayette, LA, September 18, 1995

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: September 18, 1995, 09:40 local time
- Place: Lafayette, LA
- Airport: Lafayette Regional
- Phase of flight: Final Approach
- Operating rules: Air taxi and commuter (Part 135)
- Operator: HEEA
- Location: 30.1593° N, 92.0304° W: From the FAA, an estimate near the named town, within about 3 miles
- Nearby events: https://openairdocs.org/map.md?lat=30.1593&lon=-92.0304&mi=10
- Aircraft: N91070, a cancelled registration (https://openairdocs.org/deregistered/N91070-2003-05-13) (OpenAirDocs)
- Registry model: Messerschmitt-Boelkow-Blohm-Gm BO-105C (registry code 5626005, https://openairdocs.org/model/messerschmitt-boelkow-blohm-gm-bo-105c) (OpenAirDocs)
- Registry engine: Allison 250-C20 series (registry code 03020, https://openairdocs.org/engine/allison-250-c20-series) (OpenAirDocs)
- Reported make and model: BOLKMS BO105C
- Reported engine: ALLSN 250C20B
- People aboard: 2
- Fatal injuries: 0
- Pilot flight hours: 7,761 total, 4,004 in this make and model, 83 in the last 90 days
- NTSB investigation: [NTSB FTW95IA397](https://openairdocs.org/ntsb/FTW95IA397) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19950918044039I

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

NARRATIVE: ON SEPTEMBER 18, 1995, AT 0940, AN MBB BO-105 HELICOPTER OWNED BY PETROLEUM HELICOPTERS, INC. (PHI), EXPERIENCED A CYCLIC HARDOVER DURING A TRAINING FLIGHT. ON A HIGHWAY APPROACH TO THE AIRPORT IN LAFAYETTE, LOUISIANA, THE AIRCRAFT ABRUPTLY AND VIOLENTLY PITCHED NOSE DOWN. THE PILOT TO WHOM THE CHECKRIDE WAS BEING GIVEN AND THE CHECK AIRMAN PULLED AFT ON THE CYCLIC TO LEVEL THE AIRCRAFT. THE PILOT-IN-COMMAND (PIC) ESTIMATES THAT THE AIRCRAFT PITCHED DOWN 90 DEGREES BUT LESS THAN 100 FEET WAS LOST. LOOSE EQUIPMENT WAS THROWN ABOUT THE CABIN. THERE WAS NO INJURY TO PERSONNEL OR DAMAGE TO THE AIRCRAFT. ONCE CONTROL WAS RE-ESTABLISHED, THE PIC SAW THAT THE "HYDRAULIC BLOCK" LIGHT WAS ILLUMINATED AND THE MAST MOMENT INDICATOR (MMI) LIMIT LIGHT WAS ON STEADY. THE AIRCRAFT WAS LANDED ON THE PHI HELIPORT AT THE LAFAYETTE AIRPORT WITHOUT FURTHER INCIDENT. MAINTENANCE DISCOVERED THAT THE HYDRAULIC SYSTEM HAD SWITCHED OVER TO THE NO. 2 SYSTEM. AFTER ROTATING THE MAIN ROTOR BLADES, THE HYDRAULIC SYSTEM SWITCHED BACK TO THE NO. 1 SYSTEM. THE HYDRAULIC PACK WAS REMOVED FROM THE AIRCRAFT AND TAGGED BY THE BATON ROUGE FLIGHT STANDARDS DISTRICT OFFICE. THE HYDRAULIC PACK WAS SENT TO THE MANUFACTURER FOR EVALUATION AND TESTING.

## The NTSB's investigation of this event (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 FTW95IA397](https://openairdocs.org/ntsb/FTW95IA397), Sep 18, 1995: MBB BO-105C (N91070), Lafayette, LA, incident, no damage. Probable cause: a short in the 'jam proof system' solenoid valve which prevented activation of the backup hydraulic system and resulting in a cyclic hardover. Factors were the contaminated hydraulic fluid and the…

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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