# Incident 19950329010299I: Boeing 737300, Taft, CA, March 29, 1995

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: March 29, 1995, 10:00 local time
- Place: Taft, CA
- Airport: San Jose International
- Phase of flight: Normal Cruise
- Operating rules: Air carrier (Part 121)
- Operator: SWAA
- Location: 35.1267° N, 119.4242° W: Placed by OpenAirDocs: center of Taft, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=35.1267&lon=-119.4242&mi=10
- Aircraft: N673AA, a cancelled registration (https://openairdocs.org/deregistered/N673AA-2009-04-21) (OpenAirDocs)
- Registry model: Boeing 737-3A4 (registry code 138447H, https://openairdocs.org/model/boeing-737-3a4) (OpenAirDocs)
- Registry engine: CFM International CFM56 series (registry code 13802, https://openairdocs.org/engine/cfm-international-cfm56-series) (OpenAirDocs)
- Reported make and model: BOEING 737300
- People aboard: 73
- Fatal injuries: 0
- Pilot flight hours: 10,000 in this make and model, 162 in the last 90 days
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19950329010299I

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

NARRATIVE: WHILE IN CRUISE FLIGHT AT 35,000' MSL, AT MACH .745, FIRST OFFICER WALTER WAS FLYING N673AA ON AN INBOUND COURSE TO AVENAL VOR. APPROXIMATELY THIRTY (30) MINUTES INTO THE FLIGHT, CAPTAIN STATED N673AA FELT AS THEY ENCOUNTERED WAKE TURBULENCE FOLLOWED IMMEDIATELY BY AN UNCOMMANDED, BUT NON-VIOLENT, ROLL TO THE RIGHT, TO APPROXIMATELY 20 TO 25 DEGREE BANK. THE AIRCRAFT LOST APPROXIMATELY 300' ALTITUDE WHILE FIRST OFFICER AND CAPTAIN ATTEMPTED TO REGAIN FULL CONTROL OF N673AA. CAPTAIN DUKE ASSUMED COMMAND, CHECKED TCAS DISPLAY FOR TRAFFIC, MANUALLY DISENGAGED THE SELECTED "B" SYSTEM AUTO-PILOT WITH SOUNDING OF SUBSEQUENT AUTO-PILOT AURAL WARNING, APPLIED 1/4 LEFT RUDDER INPUT, AND BROUGHT WINGS LEVEL. HE STATED WITH AUTO-PILOT DISCONNECTED, HE GAINED MORE LEFT AILERON CONTROL. ESTIMATED TIME DURATION FROM UNCOMMAMDED ROLL, BACK TO WINGS LEVEL, WAS TWENTY (20) SECONDS. NO OTHER COCKPIT AURAL WARNINGS WERE HEARD DURING THE OCCURRENCE. WITH WINGS LEVEL, THE CONTROL YOKE WAS APPROXIMATELY 35 DEGREES, LEFT AILERON DOWN. WITHOUT FLIGHT CREW'S CONTROL INPUT, BOTH CAPTAIN AND FIRST OFFICER ESTIMATED N673AA WOULD HAVE ROLLED INVERTED WITHIN TEN (10) SECONDS FROM INITIATION OF UNCOMMANDED ROLL. FIRST OFFICER WALTER REPORTED FULL RIGHT RUDDER INDICATION AND COMMENCED A MEMORIZED QUICK REFERENCE HANDBOOK (QRH) PROCEDURE AND REQUESTED TO DISCONNECT THE YAW DAMPER SYSTEM. CAPTAIN CONFIRMED AND ORDERED YAW DAMPER BE DISCONNECTED. UPON YAW DAMPER DISCONNECT, CONTROL YOKE RETURNED TO 0 DEGREES, WINGS REMAINED LEVEL, AND RUDDER RETURNED TO CENTER. DUE TO ALTITUDE RESTRICTIONS WITH YAW DAMPER INOPERATIVE, FIRST OFFICER REQUESTED A DESCENT TO 28,000' MSL. WHEN ATC COULD NOT PROVIDE IMMEDIATE CLEARANCE, CAPTAIN IMMEDIATELY REQUESTED DESCENT VECTORS TO 28,000' MSL. ATC RESPONDED BY VECTORING N673AA BE QUARANTINED PENDING FURTHER INVESTIGATION. THE NTSB, WASHINGTON DC HAS CONTROL OF THIS INVESTIGATION AND HAS COORDINATED WITH SWAA TO HAVE THE REMOVED COMPONENT TESTED. LARRY SMITH, AAI-100 IS THE FAA POC. IF FINDINGS ARE RELEASED TO THIS OFFICE, WE WILL AMEND THIS REPORT.

## Other reports on N673AA (1)

Matched to the same aircraft by N-number and date.

- [Incident 19961222042819I](https://openairdocs.org/incident/19961222042819I), Dec 22, 1996: Boeing 7373A4 (N673AA), Kansas City, MO. Inoperative transponder on climbout from airport. Returned. Put it on MEL. Continued flight.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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