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NTSB Report
May 15, 1984 · De Havilland DHC-7-102 · N708ZW
Battle Creek, MI
Overview
Report Status
Preliminary report
Event Type
Incident
Date
May 15, 1984
Injury Outcomes
No injuries (25 uninjured)
Location
Battle Creek, MI
Aircraft
De Havilland DHC-7-102
Tail Number
N708ZW
Injuries
None
NTSB Number
CHI84IA197
WHILE CRUISING AT 7000 FT MSL, THE 1ST OFFICER WAS TRIMMING THE RUDDER, USING THE ROTARY SWITCH ON THE CENTER CONSOLE, WHEN HE FELT A 'SNAP' INSIDE THE SWITCH. AFTER THAT, THE SWITCH WOULD ROTATE FREELY BETWEEN THE STOPS. THE ACFT BEGAN YAWING LEFT & RIGHT UNTIL THE CREW PULLED THE APPROPRIATE CIRCUIT BREAKER TO DISABLE THE RUDDER TRIM. SUBSEQUENTLY, THEY LANDED WITH FULL RIGHT RUDDER TRIM. AN EXAM REVEALED THAT A CENTERING SPRING, P/N 42M4231137, WHICH LOADS THE SWITCH TO THE NEUTRAL/OFF POSITION HAD FAILED AT A FATIGUE CRACK.
Full Narrative
WHILE CRUISING AT 7000 FT MSL, THE 1ST OFFICER WAS TRIMMING THE RUDDER, USING THE ROTARY SWITCH ON THE CENTER CONSOLE, WHEN HE FELT A 'SNAP' INSIDE THE SWITCH. AFTER THAT, THE SWITCH WOULD ROTATE FREELY BETWEEN THE STOPS. THE ACFT BEGAN YAWING LEFT & RIGHT UNTIL THE CREW PULLED THE APPROPRIATE CIRCUIT BREAKER TO DISABLE THE RUDDER TRIM. SUBSEQUENTLY, THEY LANDED WITH FULL RIGHT RUDDER TRIM. AN EXAM REVEALED THAT A CENTERING SPRING, P/N 42M4231137, WHICH LOADS THE SWITCH TO THE NEUTRAL/OFF POSITION HAD FAILED AT A FATIGUE CRACK.
Flight
Event TypeIncident
Event Time14:10 EDT
Nearest Airport0nm N
Runway0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftDe Havilland DHC-7-102
Tail NumberN708ZW
Aircraft CategoryAir
Operating RulePart 121
Engines4
Engine TypeTurbojet
Engine DetailsP&W · PT6A-50 · Turbojet · 1600
Seats59
People & Injuries
Injury SummaryNo injuries (25 uninjured)
Fatal0
Serious0
Minor0
Uninjured25
Total25
Crew 1Age 34 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind10°
Visibility15 sm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Observation Time22:22
Weather SourcePILO