 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
An MD80 on final approach at 1200 ft declared an emergency due to unable to control aircraft pitch nose up with flaps at 40 degrees. Cause unknown.
| Attributes | |
| ACN | 525371 |
| Time | |
| Date | 200109 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : bos.airport |
| State Reference | MA |
| Altitude | msl single value : 1200 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : bos.tower |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Experience | flight time last 90 days : 230 flight time total : 9000 flight time type : 800 |
| ASRS Report | 525371 |
| Person 2 | |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : pitch trim indicator other flight crewa other flight crewb |
| Resolutory Action | flight crew : landed in emergency condition flight crew : declared emergency flight crew : regained aircraft control |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
On final runway 4R after setting landing flaps (40 degrees), aircraft pitched up. Yoke was pushed forward full travel, and stabilizer trim nose continued to pitch up. Flaps set back to flaps 28 degrees, with a positive effect, but nose still up and speed slow and getting slower. Power was also added with negative results. Power was reduced. Alternate trim used. Aircraft was able to be controled. Emergency declared. Landed immediately on runway 27 with no injuries or damage to aircraft. Callback conversation with reporter revealed the following information: the reporter stated the cause of the loss of the primary stabilizer control is unknown to the reporter as maintenance did not forward any report to the crew on the maintenance action taken. The reporter said the crew suspected an aft center of gravity problem or a runaway primary trim motor. The reporter stated pitch trim was regained using the alternate trim system.
Original NASA ASRS Text
Title: AN MD80 ON FINAL APCH AT 1200 FT DECLARED AN EMER DUE TO UNABLE TO CTL ACFT PITCH NOSE UP WITH FLAPS AT 40 DEGS. CAUSE UNKNOWN.
Narrative: ON FINAL RWY 4R AFTER SETTING LNDG FLAPS (40 DEGS), ACFT PITCHED UP. YOKE WAS PUSHED FORWARD FULL TRAVEL, AND STABILIZER TRIM NOSE CONTINUED TO PITCH UP. FLAPS SET BACK TO FLAPS 28 DEGS, WITH A POSITIVE EFFECT, BUT NOSE STILL UP AND SPD SLOW AND GETTING SLOWER. PWR WAS ALSO ADDED WITH NEGATIVE RESULTS. PWR WAS REDUCED. ALTERNATE TRIM USED. ACFT WAS ABLE TO BE CTLED. EMER DECLARED. LANDED IMMEDIATELY ON RWY 27 WITH NO INJURIES OR DAMAGE TO ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THE LOSS OF THE PRIMARY STABILIZER CTL IS UNKNOWN TO THE RPTR AS MAINT DID NOT FORWARD ANY RPT TO THE CREW ON THE MAINT ACTION TAKEN. THE RPTR SAID THE CREW SUSPECTED AN AFT CTR OF GRAVITY PROB OR A RUNAWAY PRIMARY TRIM MOTOR. THE RPTR STATED PITCH TRIM WAS REGAINED USING THE ALTERNATE TRIM SYS.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.