N369MH - 1978 HUGHES 369D - Complete Aircraft History & Registry Information

Quick Facts & Current Owner

Current Owner
AA LEASING LP
Location
KILAUEA, Hawaii
Registration Status
Active until 05-31-2031
Serial Number
380287D
Last Seen on Market
Never Listed
Last Seen Airborne
February 2025
Last FAA Action Date
May 2024
Owned Since
May 2024
Location of N369MH in KILAUEA, Hawaii

About the HUGHES 369D

The Hughes 369D, also known as the MD 500D, is a light utility helicopter of note in the general aviation sector. It traces its lineage back to the OH-6A Cayuse, a military helicopter developed in the 1960s by Hughes Helicopters (which later became part of McDonnell Douglas). The OH-6A was known for its versatility, ruggedness, and exceptional performance in various missions, particularly during the Vietnam War. Building on the success of the OH-6A, Hughes sought to create a civilian version that could serve a wide range of industries where agility and reliability were paramount. Thus, the Hughes 369 model line was born, with the 369D being one of its most prominent members. The Hughes 369D made its debut in the late 1970s and quickly gained a reputation as a workhorse in the light helicopter market. It featured a more powerful Allison 250-C20B turboshaft engine, which allowed for improved performance, higher speeds, and greater payload capacity compared to its predecessors. The helicopter's five-blade main rotor system further enhanced its smooth handling and flight stability. In terms of design, the 369D maintained the sleek, aerodynamic shape characteristic of Hughes helicopters, which contributed to its efficiency and agility. The aircraft was designed for a variety of applications including law enforcement, emergency medical services, agricultural operations, and executive transport. Its compact size and superior maneuverability made it particularly effective in urban environments and other areas where space was limited. Additionally, the 369D was lauded for its low operating costs and ease of maintenance, making it a popular choice among private owners and commercial operators alike. The Hughes 369D stands as a testament to innovative helicopter design, providing reliable service across multiple sectors for decades. Its success also paved the way for further developments in the Hughes/MD helicopter lines, ensuring its legacy in the annals of aviation history.



Flight History and Activity for N369MH

Last Observed Flight

February 11, 2025

Near Barbers Point Housing, HI

Monthly Activity

0

Flights in past 30 days

Annual Activity

741

Flights in past 12 months

Last Known Location

Last flight location of N369MH

Maintenance and Safety Records

Safety Record Summary

  • 2 accident/incident report(s) on file
  • 2 service difficulty report(s) filed

Accident and Incident Reports

August 08, 2018 - HONOLULU, Hawaii

Damage Level
Substantial
Description
ON AUGUST 8, 2018, ABOUT 0920 HAWAII‐ALEUTIAN STANDARD TIME, A HUGHES 369D HELICOPTER, N369MH, EXPERIENCED A SIGNIFICANT INFLIGHT VIBRATION EVENT, WHICH RESULTED IN THE PILOT EXECUTING AN EMERGENCYLANDING TO A SCHOOL FIELD IN HONOLULU, HAWAII. THE COMMERCIAL PILOT AND HIS 3 PASSENGERS WERE NOT INJURED. THE HELICOPTER WAS SUBSTANTIALLY DAMAGED. THE HELICOPTER WAS REGISTERED TO SCHUMAN CARRIAGE COMPANY LTD, AND OPERATED AS A TITLE 14 CODE OF FEDERAL REGULATIONS PART 136 AIR TOUR FLIGHT, DOING BUSINESS AS MAGNUM HELICOPTERS. VISUAL METEOROLOGICAL CONDITIONS PREVAILED FOR THE FLIGHT. THE FLIGHT ORIGINATED FROM THE OPERATOR'S FACILITY AT HONOLULU INTERNATIONAL AIRPORT (HNL), HONOLULU, HAWAII ABOUT 0909.

August 08, 2018 - Honolulu, Hawaii

Damage Level
Substantial
Description
The pilot of the helicopter commercial air tour flight stated that the helicopter was in cruise flight at an altitude of about 1,800 ft when, about 11 minutes after takeoff, he felt "severe" vibrations and then heard a "loud bang," after which the helicopter began to shake "violently." The pilot entered a power-on autorotation and stated that the severity of the vibration caused the transponder to shake free of its mount in the instrument panel. He also stated that even small tail rotor pedal inputs significantly worsened the vibrations. The pilot conducted a partial run-on landing in a field. Examination revealed that multiple tail rotor blade and gearbox components had failed in flight, rendering the helicopter substantially damaged. The helicopter tail rotor (TR) transmission was mounted on the aft end of the tail boom, and the four-blade TR assembly mounted onto a four-arm fork that mounted on the output shaft of the TR transmission. The TR blade assembly comprised a pair of two-blade rotor assemblies that attached to the fork. A teeter bearing mounted in each fork arm, and each two-blade rotor assembly was secured in its fork arm pair by a teeter bolt that suspended it between, and was suspended by, the two teeter bearings. At least two different tail boom versions were available for the accident model helicopter. One was the original McDonnell-Douglas Helicopters, Inc (MDHI) version, and the other was an aftermarket version produced by a company called Aerometals. The accident helicopter was equipped with the Aerometals tail boom. The primary difference between the two tail boom versions was the attachment method of the TR transmission to the tail boom. The MDHI version used studs and locking nuts, whereas the Aerometals version used bolts and locking nut plates. Both versions used a total of four attach fasteners. Postaccident examination revealed that the two bolts that attached the left side of the TR transmission to the tail boom had fractured and partially pulled through their nut plates. The two right side attach bolts were damaged, but had not failed; instead, their respective mounting lugs on the TR transmission had failed. The failure of all four attachments meant that the TR assembly was retained on the helicopter by only the TR drive shaft and the pitch control linkage. Neither of those components was designed to retain the TR transmission, and the pitch control system incurred damage during the event. The TR assembly was on the verge of imminent failure. Based on the observed damage, it is likely that with continued operation, the TR would have very shortly separated from the helicopter, rendering control difficult or impossible. All four TR blades remained attached to the fork, but the outer (furthest from the transmission) blade pair remained only partially attached to the fork. The outer teeter bolt was fractured and only a portion of it was recovered. Of the two teeter bearings that were normally mounted in the outer pair of fork arms, one was absent and presumed lost in flight. The remaining outer teeter bearing had debonded from its fork arm, and both it and its fork arm seat exhibited fretting damage on their mating surfaces. The fretting indicated that there was relative motion between the bearing and its seat, caused by helicopter operation with a debonded bearing. Detailed laboratory examinations revealed that the fractured teeter bolt and the two fractured attach bolts had all failed in fatigue. The examinations also revealed several discrepancies with the repair and installation of some of the TR components, as well as some discrepancies within the applicable maintenance and inspection guidance. The teeter bearings had been improperly installed in the fork during overhaul or during maintenance by the operator. Contrary to MDHI overhaul guidance, none of the four teeter bearing installations, including the two debonded ones for the outer blade pair, displayed any evidence of the presence of either primer or scrim cloth. "Scrim cloth" was a single-ply layer of glass fabric that should have been installed at the bearing-fork mating juncture to ensure proper bonding of the adhesive that secured the bearing in its fork seat. An overhauled fork includes installed teeter bearings, and the maintenance records indicated that the accident fork was overhauled by an outside vendor. Information provided by the operator indicated that it had not replaced or reinstalled any of the bearings, and the available records did not specify the serial numbers of the bearings installed during the overhaul. However, contrary to the operator-provided information, research revealed that the operator had independently purchased at least five bearings subsequent to the installation of the overhauled fork, and that at least two of those bearings, including one that had disbonded from the fork, were installed on the helicopter at the time of the accident. The operator was unable to provide any explanation for the improper repair or why their installation of new teeter bearings was absent from the maintenance records. Subsequent to these findings, an FAA search of the operator's premises did not locate any additional overhauled TR assemblies. Contrary to the MDHI TR transmission installation guidance, paint was observed on the faying surfaces of the transmission-tail boom mounting pads. The operator had partially cleaned these surfaces during postaccident removal of the transmission before the investigative examination took place; therefore, the thickness or condition of that paint, or a reliable estimate of its effect on the joint clamp-up, could not be determined. Reduction in joint clamp up, due to compression or breakdown of the paint in the joint, particularly over time, has the potential to result in shear failure of the attachment hardware threads and/or fatigue and failure of the attach hardware, by allowing relative motion between the TR transmission and the tail boom. This condition can be aggravated by increased vibrations due to multiple sources, including but not limited to TR imbalance, disbonded or deteriorated elastomeric bearings, and improper torque of the TR transmission attach hardware. When asked, the operator was unable to provide any explanation for the improper paint application. The available evidence indicates that the failure sequence began with the disbonding of one or both of the improperly installed outer teeter bearings from their respective fork seats. This permitted increased vibration of the TR, which then caused the outer teeter bolt to rapidly fatigue and fracture. The fracture failure of the outer teeter bolt resulted in the in-flight liberation of one outer teeter bearing and a segment of the outer teeter bolt. This further increased the vibration level, which caused the failure of all four structural attach points that secured the TR transmission (including the TR) to the tail boom and resulted in the TR being retained on the helicopter only by the TR drive shaft and the pitch control linkage. Neither of those components was designed to retain the TR transmission, and likely would have failed rapidly with continued operation, resulting in loss of the TR. The pilot's decision to land as quickly as possible likely prevented the loss of the TR and subsequent loss of control of the helicopter.

Service Difficulty Reports

May 12, 2015

DURING A FLIGHT THE PILOT EXPERIENCED EXCESSIVE VIBRATION. THE PILOT MADE A PRECAUTIONARY LANDING & NOTIFIED MX. MX DI

June 12, 2019

DURING CRUISE FLIGHT THE PILOT EXPERIENCED AN EXCESSIVE TAIL ROTOR VIBRATION. THE PILOT THEN EXECUTED A PRECAUTIONARY LA

Complete History Timeline

📋

May 2024

Registration

Registered to AA LEASING LP in KILAUEA, HI




📋

May 2023

Registration

Registered to SCHUMAN AVIATION COMPANY LTD in HONOLULU, HI




📋

Apr 2023

Registration

Registered to SCHUMAN AVIATION COMPANY LTD in HONOLULU, HI




📋

Apr 2021

Registration

Registered to SCHUMAN CARRIAGE COMPANY LTD in HONOLULU, HI




🔧

Jun 2019

Service Report

Service difficulty report added




⚠️

Aug 2018

Accident/Incident

Accident with substantial damage




⚠️

Aug 2018

Accident/Incident

Accident with substantial damage




📋

Apr 2018

Registration

Registered to SCHUMAN CARRIAGE COMPANY LTD in HONOLULU, HI




📋

May 2015

Registration

Registered to SCHUMAN CARRIAGE COMPANY LTD in HONOLULU, HI




🔧

May 2015

Service Report

Service difficulty report added




📋

Sep 2012

Registration

Registered to SCHUMAN CARRIAGE COMPANY LTD in HONOLULU, HI




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Frequently Asked Questions

Who owns N369MH?

N369MH is currently registered to AA LEASING LP in KILAUEA, Hawaii.

What type of aircraft is N369MH?

N369MH is a 1978 HUGHES 369D with serial number 380287D.

Has N369MH been in any accidents?

Yes, N369MH has 2 accident/incident report(s) on file with the FAA/NTSB.