N455MH
Registered owner: MEMORIAL HERMANN HEALTH SYSTEM, TX (owner ≠ operator)
Operators of this aircraft
Who operated this tail, and how firmly we know it.
| Operator | Role | Period | Basis |
|---|---|---|---|
| Memorial Hermann Health System (GVNA) | Certificate holder | — | Matched by certificate designator |
| Memorial Hermann Health System (GVNA) | Operator | on 2012-07-24 | Operator named in NTSB report |
Accident & incident history
Operated by MEMORIAL HERMANN HOSPITAL SYSTEM (per NTSB report)
Maintenance disclosures
Service Difficulty Reports filed with the FAA for this airframe. Filing is largely voluntary — the number of reports is not a measure of reliability. To verify a report, search its control number at the FAA SDRS site.
7 reports on file, 2021-11-22 – 2025-05-20.
Part: FUEL CONTROL — INOPERATIVE (NR 1 ENGINE) · airframe 10,545 hrs · 46,527 cycles
WHEN CLIMBING OUT FROM A HELIPAD TO A HIGH HOVER AT HIGH POWER SETTINGS, THE #1 ENGINE DROPPED OFFLINE CAUSING A LARGE TORQUE SPLIT WITH THE #2 ENGINE GOING UP TO MAX OEI TORQUE FOR ABOUT 10 SECONDS WHILE THE PILOT LANDED. THE #1 ENGINE DID NOT RESPOND TO TRIM INPUTS ATTEMPTING TO MATCH THE TORQUES DURING THIS EVENT. THE AIRCRAFT WAS LANDED WITHOUT INCIDENT AND MAINTENANCE WAS CALLED. THE MECHANIC FOUND A DISPLACED PIN AND ROLLER IN THE P2 CHAMBER OF THE #1 FUEL CONTROL. THE FUEL CONTROL WAS CHANGED AND THE AIRCRAFT RETURNED TO SERVICE AFTER VARTOMS ADJUSTMENTS TO THE NEW FUEL CONTROL.
Part: OIL COOLER — SHEARED (M/R GEARBOX) · airframe 9,444 hrs · 42,056 cycles
#2 ENG OIL COOLER, SUSPECTED SHAFT BROKEN. REPORTED #2 ENG OIL TEMP FLUCTUATION. INSP REVEALED #2 ENG OIL COOLER SHAFT SHEARED. REM'D #2 OIL COOLER FAN ASSY. INSTALLED SERVICEABLE FAN ASSY, P/N SAME. PERFORMED GROUND RUN/LEAK CHK W/NO ANOMALIES. ACFT RETURNED TO SERVICE.
Part: PRESSURE SWITCH — FAILED (NR 2 ENGINE)
ON ENG STARTUP, #2 ENG, LOW FUEL PRESS LIGHT ILLUMINATED. REM'D #2 ENG LOW FUEL PRESS SWITCH. INSTALLED NEW PRESSURE SWITCH. PERFORMED GROUND RUN. FUNCTION CHK'D GOOD.
Part: DRAIN VALVE — LEAKING (ZONE 200) · airframe 9,043 hrs · 40,434 cycles
MEDICAL CREW REPORTED A FUEL SMELL IN THE CABIN AND PILOT LANDED AT THE NEAREST AIRPORT. MECHANIC FOUND THE #2 ENGINE START DRAIN VALVE LEAKING WHEN THE PRIME PUMP WAS ACTIVATED. FUEL DRAINED FROM THE ENGINE DECK DRAIN TUBE AND BLEW AROUND THE LOWER CLAMSHELL DOOR SEALS AT THE BACK OF THE CABIN ALLOWING FUMES INTO THE CABIN. START DRAIN VALVE WAS REPLACED AND THE AIRCRAFT WAS RETURNED TO SERVICE.
Part: DRAIN VALVE — VAPOR (ZONE 400) · airframe 8,568 hrs
DURING CRUISE FLIGHT, MEDCREW REPORTED FUEL SMELL, ENTERING CABIN AREA. SUSPECT FUEL LEAKAGE VENTING, AND RESIDUAL SMELL INADVERTENTLY VENTING INTO CABIN AREA. REM'D #2 START DRAIN VALVE ASSY. INSTALLED SERVICEABLE START DRAIN VALVE ASSY. NO OTHER DEFECTS NOTED.
Part: TEE FITTING — BLOCKED (ZONE 400)
#2 ENG OIL PRESS ILLUMINATED DURING FLIGHT. DIVERT TO LOCAL AIRPORT(KSGR), FOR PRECAUTIONARY LANDING. UNEVENTFUL AND SAFE LANDING. UPON FURTHER INSP, FOUND "T" FITTING ON ENG, CLOGGED. REPLACED "T" FITTING, AND START DRAIN VALVE, AS REQUIRED. PERFORMED SEVERAL ENG RUNS WITH PWR CHKS. ENGINE PERFORMED TO SPECS, WITHOUT FURTHER ANOMALIES OR DISCREPANCIES. PERFORMED OPERATION CHK FLIGHT. CHK'D GOOD. ACFT RETURNED TO SERVICE. REM'D PARTS, BEING SENT TO MFG, FOR FURTHER INVESTIGATION.
Part: VENT LINE — CLOGGED (ZONE 400)
#2 ENG OIL PRESSURE FLUCTUATED IN FLIGHT INTO CAUTION RANGE, AND INTO NORMAL RANGE. AFTER TROUBLESHOOTING, FOUND OIL TANK EMPTY. FOUND CLOGGED VENT LINE, WHICH ALLOWED OIL TO BE SIPHONED OUT DURING OPERATION. CLEANED P2 AIR LINE AND T FITTING. CLEANED BLEED VALVE FILTER. CLEANED AND INSPECTED ALL CHIP DETECTORS. FILLED OIL TANK TO PROPER LEVEL. PERFORMED OPS CHK FLIGHT AND FOUND SATISFACTORY.