- Date
- December 6, 1987, 13:23 local (21:23 UTC)
- Place
- Twentynine Plms, CA
- Injuries
- 2 uninjured
- Damage
- No damage
- Phase of flight
- Enroute
- Aircraft
- N125PSCanadair CL600-2A12
- Weather
- Visual (VMC) · Day
- Status
- Completed · report July 10, 1989
- Report
- Approved by Office Director
- FAA report
- 19871206075519I
- Case key
- 40739
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the incident.
On this page
Sequence of events
NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.
Analysis
The water filter housing lower seal was mis-installed which allowed water to seep out and run down the housing case. Over time the water dropped onto a lavatory drain line, followed the line to a low point & collected on the stab aug computer box. The fluid accumulation resulted in corrosion on one of the circuit boards within the computer box causing a power imbalance within the yaw damper system and a subsequent uncommanded rudder signal. Drg the climb to cruise transition a mach trim failure occurred which would have necessitated the use of the autopilot for speeds in excess of 0.7 mach. Operation of the autopilot, however, resulted in operation of the yaw damper system which had been determined to have been producing uncommanded rudder inputs. As the acft was levelled at FL330 and the airspd was allowed to exceed mach 0.7 the coplt activated the autoplt which powered the malfunctioning damper system and a dutch roll maneuver ensued. PIC disconnected the autoplt, executed a descent and recovery.
Aircraft
- Registration
- N125PS
- Reported as
- Canadair CL600-2A12
- Category
- Airplane
- Serial number
- 3058
- Airframe hours
- 336
- Engine
- GE CF34-1A, 8,600 lbs thrust, turbo fan
- Damage
- No damage
- Flight
- Personal · Part 91 subpart F
- Registered owner
- Omni Restaurant Consulting Cor
- Airworthiness certificate
- Standard, Transport
- Last inspection
- 100 hour · October 29, 1987 · 36 hours before
- Departed
- SNA · Santa Ana, CA
- Destination
- LAS · Las Vegas, NV
- Flight plan
- IFR
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 49
- Certificates
- Airline transport, Flight instructor
- Airplane ratings
- Single-engine land, Multi-engine land
- Instrument ratings
- Airplane
- Medical
- Class 1, Valid Medical--w/ waivers/lim
- Seat
- Right
- Flight hours
- 10,510 total · 325 in this make and model · 10,195 as pilot in command · 150 in the last 90 days · 1 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 260° at 65 knots
- Visibility
- 100 statute miles
- Lowest ceiling
- None
- Temperature
- 55 °F
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.
Other investigations on N125PS · 1
Matched to the same aircraft by N-number and date.