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NTSB Report
September 22, 1984 · Sikorsky S-76A · N79K
Unionville, PA
Overview
Report Status
Preliminary report
Event Type
Accident
Date
September 22, 1984
Injury Outcomes
No injuries (8 uninjured, 6 unknown outcomes)
Location
Unionville, PA
Aircraft
Sikorsky S-76A
Tail Number
N79K
Injuries
None
Aircraft Damage
Substantial
NTSB Number
NYC84FA319
ON APPROACH, ACFT YAWED RIGHT. PLT REDUCED POWER AND EXECUTED EMERG LNDG. BEFORE SHUTDOWN, IT WAS NOTED THE T/R WAS STATIONARY WHILE THE MAIN ROTOR CONTINUED TO TURN. INVESTIGATION REVEALED T/R DRIVE SHAFT HAD SEPARTED DUE TO THERMAL/MECHANICAL DAMAGE INCURRED BY CONTACT WITH ENGINE FIREWALL. FURTHER INVESTIGATION REVEALED THAT A FIREWALL MODIFICATION HAD BEEN DESIGNED WHICH INCLUDED A DOUBLER STRIP AT THE FWD AND AFT FIREWALL SECTION CONNECTION. PRESENCE OF DOUBLER WOULD DECREASE CLRNC BETWEEN FIREWALL AND T/R SHAFT. IT WAS FURTHER DETERMINED THAT, DURING INSTALLATION, THE FWD FIREWALL SECTION, TO WHICH THE DOUBLER IS ATTACHED, WAS MISPOSITIONED WITH RESULT THAT CLRNC WAS REDUCED TO NIL. COMPONENTS CAME INTO CONTACT DURING OPERATIONS.
Full Narrative
ON APPROACH, ACFT YAWED RIGHT. PLT REDUCED POWER AND EXECUTED EMERG LNDG. BEFORE SHUTDOWN, IT WAS NOTED THE T/R WAS STATIONARY WHILE THE MAIN ROTOR CONTINUED TO TURN. INVESTIGATION REVEALED T/R DRIVE SHAFT HAD SEPARTED DUE TO THERMAL/MECHANICAL DAMAGE INCURRED BY CONTACT WITH ENGINE FIREWALL. FURTHER INVESTIGATION REVEALED THAT A FIREWALL MODIFICATION HAD BEEN DESIGNED WHICH INCLUDED A DOUBLER STRIP AT THE FWD AND AFT FIREWALL SECTION CONNECTION. PRESENCE OF DOUBLER WOULD DECREASE CLRNC BETWEEN FIREWALL AND T/R SHAFT. IT WAS FURTHER DETERMINED THAT, DURING INSTALLATION, THE FWD FIREWALL SECTION, TO WHICH THE DOUBLER IS ATTACHED, WAS MISPOSITIONED WITH RESULT THAT CLRNC WAS REDUCED TO NIL. COMPONENTS CAME INTO CONTACT DURING OPERATIONS.
Flight
Event TypeAccident
Event Time11:30 EDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftSikorsky S-76A
Tail NumberN79K
Aircraft CategoryHeli
DamageSubstantial
Operating RulePart 135
Engines2
Engine TypeTurboshaft
Engine DetailsAllison · A250C30S · Turboshaft · 650
Seats8
People & Injuries
Injury SummaryNo injuries (8 uninjured, 6 unknown outcomes)
Fatal0
Serious0
Minor0
Uninjured8
Total14
Crew 1Age 39 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind160° @ 3 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point70 F / 52
Altimeter30.00 inHg
Observation Time14:51