# N91070: 1974 Messerschmitt-Boelkow-Blohm-Gm BO-105C, registration cancelled 2003-05-13 - Type: Cancelled registration (FAA registry, deregistered aircraft) - Cancelled: May 13, 2003 - Status when cancelled: Triennial form not returned - Airframe: [Messerschmitt-Boelkow-Blohm-Gm BO-105C](https://openairdocs.org/model/messerschmitt-boelkow-blohm-gm-bo-105c) (registry code 5626005) - Engine: [Allison 250-C20 series](https://openairdocs.org/engine/allison-250-c20-series) (registry code 03020) - Data sheets: [TCDS H3EU](https://openairdocs.org/tcds/H3EU), [TCDS E4CE](https://openairdocs.org/tcds/E4CE) (OpenAirDocs) - Serial number: S145 - Year built: 1974 - Type of aircraft: Rotorcraft - Engine type: Turbo-prop - Airworthiness: Standard, normal - Airworthiness date: September 18, 1987 - Certificate issued: October 26, 1994 - Last registry action: November 14, 2000 - Mode S code: AC9A11 - Owner when cancelled: [Petroleum Helicopters Inc](https://openairdocs.org/faa-owner/PETROLEUM%20HELICOPTERS%20INC) - Location: [Lafayette, LA](https://openairdocs.org/faa-place/LA/Lafayette) - Owner type: Corporation - Owner's area on the map: 30.1552° N, 92.0282° W: Placed by OpenAirDocs at the center of ZIP code 70508, within about 3 miles (OpenAirDocs). The owner's mailing address, not where the aircraft was based - The mark today: https://openairdocs.org/aircraft/N91070 - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=91070 - Page: https://openairdocs.org/deregistered/N91070-2003-05-13 From the FAA registry file of October 29, 2026, cancelled registrations. Owners' street addresses are left out. The Mode S code belongs to the N-number, not the airframe. ADs and bulletins for the Messerschmitt-Boelkow-Blohm-Gm BO-105C: https://openairdocs.org/model/messerschmitt-boelkow-blohm-gm-bo-105c.md ## Service difficulty reports (45) Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. - [SDR HEEA065172](https://openairdocs.org/sdr/HEEA065172), Nov 15, 1999: PUMP. INOPERATIVE. FUEL PUMP INOPERATIVE. - [SDR HEEA065161](https://openairdocs.org/sdr/HEEA065161), Nov 15, 1999: HUB. CORRODED. MAIN ROTOR HUB HAD CORROSION ON ALL FOUR PITCH HORNS. - [SDR HEEA064389](https://openairdocs.org/sdr/HEEA064389), Sep 23, 1999: TIE BOLT. MISMANUFACTURED. TIE BOLT INSPECTION REVEALED FREE LENGTH OVER MAX LIMITS AT 6.888 INCHES. - [SDR HEEA060462](https://openairdocs.org/sdr/HEEA060462), Jan 25, 1999: SWITCH. MALFUNCTIONED. WARNING LIGHT WILL NOT ILLUMINATE ZERO PRESSURE. - [SDR 98ZZZX4803](https://openairdocs.org/sdr/98ZZZX4803), Dec 7, 1998: TURBINE ROTOR. FAILED. NR 2 ENGINE OIL PRESSURE BEGAN TO FLUCTUATE IN CRUISE. LANDED WITHOUT INCIDENT. OIL LEVEL ONE AND ONE-HALF QUARTS LOW ON OIL. NO LEAKS NOTED. RE-SERVICED AND RE - [SDR HEEA0016030](https://openairdocs.org/sdr/HEEA0016030), Sep 11, 1998: STARTER. OVERHEATED. EVIDENCE OF OVERHEATING ON TERMINAL BLOCK. - [SDR HEEA0015266](https://openairdocs.org/sdr/HEEA0015266), Jul 27, 1998: TRANSCEIVER. FAILED. TRANSCEIVER CAN'T RECEIVE OR TRANSMIT. - [SDR HEEA0015095](https://openairdocs.org/sdr/HEEA0015095), Jul 1, 1998: SWITCH. FAULTY. TRANSMISSION PRESSURE LIGHT WILL NOT GO OUT. - [SDR HEEA0014661](https://openairdocs.org/sdr/HEEA0014661), Jun 8, 1998: SWITCH. INOPERATIVE. OIL PRESSURE SWITCH UNIT WOULD NOT COME ON WITH BATTERY SWITCH. - [SDR HEEA0014612](https://openairdocs.org/sdr/HEEA0014612), Jun 5, 1998: FLOOR PANEL. CORRODED. FLOOR PANEL CORRODED AND SEPARATED. - [SDR HEEA0014596](https://openairdocs.org/sdr/HEEA0014596), Jun 4, 1998: INDICATOR. READS HIGH. NR 1 NEEDLE STICKS AND STAYS 2 PERCENT HIGHER THAN OTHER NEEDLES. - [SDR HEEA0014162](https://openairdocs.org/sdr/HEEA0014162), May 11, 1998: INDICATOR. DEFECTIVE. HSI INDICATOR HAS LOOSE PARTS INSIDE. - [SDR HEEA0013252](https://openairdocs.org/sdr/HEEA0013252), Mar 4, 1998: FIRE CONT UNIT. MALFUNCTION. L/H ENGINE FIRE LIGHT INTERMITTENTLY STICKS ON. - [SDR HEEA0013201](https://openairdocs.org/sdr/HEEA0013201), Mar 4, 1998: BLADE. ERRODED. PAINT EROSION AT BLADE TIP ON S/N 646. PAINT EROSION AND RUBBER COATING PEELED OFF AT BLADE TIP ON S/N 655. - [SDR HEEA0012849](https://openairdocs.org/sdr/HEEA0012849), Feb 5, 1998: TRANSMITTER. FAILED. PRESSURE DROPS TO ZERO. - [SDR HEEA0012150](https://openairdocs.org/sdr/HEEA0012150), Nov 28, 1997: TRANSDUCER. SHORTED. TRANSDUCER INTERNALLY SHORTED. - [SDR HEEA0012149](https://openairdocs.org/sdr/HEEA0012149), Nov 28, 1997: TRANSDUCER. FAILED. TRANSDUCER TRANSMITS OUT OF TOLERANCE THROUGHOUT SCALE. - [SDR HEEA0012148](https://openairdocs.org/sdr/HEEA0012148), Nov 28, 1997: TRANSDUCER. FAILED. TRANSDUCER INTERNALLY SHORTED. - [SDR HEEA0011956](https://openairdocs.org/sdr/HEEA0011956), Nov 12, 1997: TRANSDUCER. FAILED. TRANSDUCER NO PRESSURE INDICATION. CAUSES THE GAUGE TO PEG TO ZERO SIDE ALL THREE PRESSURE BOTH ENGINES AND TRANS. INDICATOR ON SAME GAUGE. - [SDR HEEA0011955](https://openairdocs.org/sdr/HEEA0011955), Nov 12, 1997: TRANSDUCER. FAILED. TRANSDUCER HAS NO PRESSURE INDICATION. - [SDR HEEA0011609](https://openairdocs.org/sdr/HEEA0011609), Oct 21, 1997: OIL COOLER. LEAKING. OIL COOLER LEAK AT LOW CENTER RIGHT SIDE. - [SDR HEEA0011608](https://openairdocs.org/sdr/HEEA0011608), Oct 21, 1997: OIL COOLER. LEAKING. OIL COOLER WAS REPAIRED BY VENDOR ON 6-11-97. FOUND LEAKING AT TWO PLACES. - [SDR HEEA0011524](https://openairdocs.org/sdr/HEEA0011524), Oct 15, 1997: TORQUEMETER. MALFUNCTION. DUAL TORQUE METER RANGE MARKING PAINT FLAKING. NR1 TORQUE NEEDLE BOUNCES DURING FLIGHT. - [SDR HEEA0010615](https://openairdocs.org/sdr/HEEA0010615), Aug 7, 1997: SUN GEAR. SPALLED. SPALLING. REPLACED WITH SERVICEABLE PART. - [SDR HEEA0010614](https://openairdocs.org/sdr/HEEA0010614), Aug 7, 1997: PLANETARY AXLE. SPALLED. SPALLING. REPLACED WITH SERVICEABLE AXLE. - [SDR HEEA0010424](https://openairdocs.org/sdr/HEEA0010424), Jul 9, 1997: CLUTCH. BROKEN. FREEWHEEL CLUTCH HAS BROKEN CAGE. - [SDR HEEA0010283](https://openairdocs.org/sdr/HEEA0010283), Jun 26, 1997: SHAFT. CRACKED. PLATING PEALING MICRO CRACKS ON JOURNAL D & F. - [SDR HEEA0010233](https://openairdocs.org/sdr/HEEA0010233), Jun 25, 1997: SERVO MOTOR. INTERMITTENT. SERVO MOTOR WORKS INTERMITTENTLY. - [SDR HEEA0010097](https://openairdocs.org/sdr/HEEA0010097), Jun 12, 1997: CLUTCH. BROKEN. BROKEN CAGE. REPLACED WITH NEW CLUTCH. ALSO PINION P/N 4638202002, S/N 488, T.T. UNKNOWN AND F/W OUTER SHAFT P/N 4638302045, S/N 315, T.T. UNKNOWN REPLACED DUE - [SDR HEEA0010073](https://openairdocs.org/sdr/HEEA0010073), Jun 11, 1997: TRANSCEIVER. FAILED. WILL NOT TRANSMIT OR RECEIVE. NO DISPLAY. DISPLAY BOARD BURNT. - [SDR HEEA0010033](https://openairdocs.org/sdr/HEEA0010033), Jun 4, 1997: OIL COOLER. CRACKED. OIL COOLER CRACKED. - [SDR HAIHEEA9989](https://openairdocs.org/sdr/HAIHEEA9989), May 30, 1997: CLUTCH. BROKEN CAGE. FREEWHEEL CLUTCH HAS BROKEN CAGE. - [SDR HEEA968718](https://openairdocs.org/sdr/HEEA968718), Dec 13, 1996: SHAFT. PITTED. T/R SHAFT PITTING PITTING AT INBOARD BEARING JOURNAL. - [SDR HEEA967506](https://openairdocs.org/sdr/HEEA967506), Jul 5, 1996: INDICATOR. READS HIGH. READS 20 DEGREES HIGH AND WON'T CALIBRATE. - [SDR HEEA956108](https://openairdocs.org/sdr/HEEA956108), Nov 21, 1995: LORAN. DEFECTIVE. TAKES LONG TIME TO COME ON AND GOES OUT DURING FLIGHT. - [SDR HEEA956092](https://openairdocs.org/sdr/HEEA956092), Nov 21, 1995: CLUTCH. WORN. INNER CAGE WORN BEYOND LIMITS. REPLACED WITH SERVICEABLE CLUTCH. - [SDR 96ZZZX3462](https://openairdocs.org/sdr/96ZZZX3462), Sep 18, 1995: PACK ASSY. DEFECTIVE. DURING CRUISE FLIGHT, NOSE OF AIRCRAFT SUDDENLY PITCHED NOSE DOWN, HYDRAULIC BLOCK LIGHT ILLUMINATED, MAST MOMENT INDICATOR LIGHT ILLUMINATED. AFTER RECOVERY TO - [SDR HEEA955670](https://openairdocs.org/sdr/HEEA955670), Aug 31, 1995: SWITCH. MALFUNCTION. #2 ENGINE DIFFERENTIAL PRESSURE SWITCH WOULD NOT FUNCTION CHECK AS PER BO-105 M & O CHAPTER 62 PAGE 43 PARA. 62-39 ITEM #2. REPLACED DIFFERENTIAL PRESSURE SWITC - [SDR HEEA955438](https://openairdocs.org/sdr/HEEA955438), Jul 24, 1995: TRANSDUCER. DEFECTIVE. READS HIGH OUT OF TOLERANCE. - [SDR HEEA954727](https://openairdocs.org/sdr/HEEA954727), Apr 10, 1995: INDICATOR. READS HIGH. NEEDLE INDICATES 20 DEGREES CELSIUS HIGH THROUGHOUT SCALE. - [SDR HEEA954393](https://openairdocs.org/sdr/HEEA954393), Feb 21, 1995: WHEEL. SULFIDATION. ENGINE REMOVED DUE TO HIGH TOT. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: SULFIDATION ON ALL 3RD STAGE WHEEL BLADE LEADING EDGES AND OUTER BAND I.D. - [SDR HEEA954392](https://openairdocs.org/sdr/HEEA954392), Feb 21, 1995: WHEEL. SULFIDATION. ENGINE REMOVED DUE TO HIGH TOT. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: SULFIDATION ON 1ST STAGE WHEEL BLADES. SCRAPPED 1ST STAGE WHEEL. - [SDR HEEA954390](https://openairdocs.org/sdr/HEEA954390), Feb 16, 1995: BLADE. DETERIORATION. RUBBER DETERIORATION. - [SDR HEEA954389](https://openairdocs.org/sdr/HEEA954389), Feb 16, 1995: BLADE. DAMAGED. DAMAGE ON TRAILING EDGE. - [SDR HEEA954331](https://openairdocs.org/sdr/HEEA954331), Feb 10, 1995: CLUTCH. CRACKED. UPON 1200 HOUR INSPECTION FOUND SPRAG RETAINER CRACKED AND WORN BEYOND LIMITS. REPLACED WITH SERVICEABLE CLUTCH ASSEMBLY. ## NTSB investigations (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… ## FAA accident and incident reports (1) 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. - [Incident 19950918044039I](https://openairdocs.org/incident/19950918044039I), Sep 18, 1995: Bolkms BO105C (N91070), Lafayette, LA. 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… ## Other aircraft with N91070 - [Cancelled 1970-06-12](https://openairdocs.org/deregistered/N91070-1970-06-12): Douglas DC-4, S/N 7447. Owner: [Commericial Aircraft Corp](https://openairdocs.org/faa-owner/COMMERICIAL%20AIRCRAFT%20CORP), [New York, NY](https://openairdocs.org/faa-place/NY/New%20York) - [Cancelled (date not recorded)](https://openairdocs.org/deregistered/N91070-undated): Piper PA-25-235, S/N 258156024. N-number assigned, not yet registered --- 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.