TEMPORARY LOSS OF FLT CTLS.

1995-02 · NASA ASRS report 296074

Date: 1995-02 · Aircraft: B727-200 · Phase: approach

Anomalies: aircraft-equipment-problem-critical|other-unspecified

Synopsis

TEMPORARY LOSS OF FLT CTLS.

Narrative

WHILE SLOWING FROM 320 KTS TO 180 KTS AT 4600 FT THE STABILIZER 'OUT OF TRIM' LIGHT ILLUMINATED; FOLLOWED BY THE AUTOPLT NOT BEING ABLE TO MAINTAIN ALT. THE ELEVATOR INDICES SHOWED A HIGH DISPLACEMENT AND WERE NOT ABLE TO COMPENSATE AGAINST THE STABILIZER POS. THE AUTOPLT WAS DISCONNECTED ON MAIN ELECTRIC; CRUISE AND FINALLY MANUAL TRIMS WERE TRIED BUT THE STABILIZER WAS FROZEN. USING THE HANDLES ON THE STABILIZER TRIM WHEEL WOULD NOT MOVE THE STABILIZER. COMPLETED THE JAMMED FLT CTL AND JAMMED STABILIZER LNDG CHKLIST. COMPLETED A LNDG ON RWY 14L AT EDDK AFTER DECLARING AN EMER. AFTER PARKING AT THE RAMP AND CONSULTING WITH MAINT; PULLING THE STABILIZER BRAKE RELEASE ALLOWED THE STABILIZER TO OPERATE NORMALLY. AFTER CRITIQUING OURSELVES WE DISCOVERED THAT THE CHKLIST STATED IT WAS 'COMPLETE' WHEN IT HAD ADDITIONAL ITEMS THAT INCLUDED PULLING THE STABILIZER BRAKE RELEASE. THE COPLT AND I HAD TO BOTH FLY PITCH ON THE ACFT AND CONDUCTED AN EMER FOR A POORLY WRITTEN CHKLIST. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THE FLC KNEW THE SIGNIFICANCE OF THE STABILIZER OUT OF TRIM LIGHT' BEING ON AS THEY HAD SLOWED FROM 320 KTS TO 180 KTS WITH THE AUTOPLT ENGAGED. THE ELEVATOR TRIM INDICATOR WAS DISPLACED FULL UP WHEN THE AUTOPLT WAS DISENGAGED; AT THAT TIME THERE WAS HVY NOSE DOWN FORCE ON THE CTL COLUMN. BOTH PLTS WERE HOLDING THE CTL COLUMN TO PREVENT LOSS OF ALT. AT THE END OF THE CHKLIST THEY WERE USING FOR JAMMED STABILIZER; IS THE ITEM TO PULL THE 'STABILIZER BRAKE RELEASE.' THEY DISCOVERED AFTER THE EVENT IF THEY HAD DONE THAT FIRST THE STABILIZER WOULD NOT HAVE BEEN FIXED IN 1 POS. AS A RESULT OF THIS INCIDENT; THEY HAVE APPEALED TO MGMNT OF THE ACR TO MOVE THE 'STABILIZER BRAKE RELEASE' ITEM TO BE 1 OF THE FIRST ITEMS IN THE CHKLIST INSTEAD OF THE LAST ITEM. MGMNT HAS AGREED TO DO THIS. THEY NOW HAVE A GREATER AWARENESS OF THE SIGNIFICANCE OF WHAT THE 'STABILIZER OUT OF TRIM LIGHT;' MEANS WHENEVER IT COMES ON. SUPPLEMENTAL INFO FROM ACN 296644: ON APCH; BEGINNING TURN TO FINAL; AUTOPLT DISENGAGED; PLT RPTED HVY CTL FORCES; WAS UNABLE TO TRIM. TRIED NUMEROUS TIMES TO TRIM USING CRUISE AND NORMAL TRIM SYS; WAS UNABLE. CAPT CONTINUED APCH; CONCERNED THAT HE'D BETTER LAND BEFORE STICK FORCE COULDN'T BE OVERCOME. BY THIS TIME; FO WAS HELPING HIM OPPOSE CTL FORCES. I CHKED; PULLED AND RESET APPLICABLE CB'S FOR TRIM SYS -- NO HELP. WE RAN RED TAB V-LIST; DECLARED EMER AND LANDED. AFTER UNEVENTFUL LNDG; WE REALIZED OUR RED TAB V-LISTS DEALING WITH STABILIZER TRIM AND FLT CTL MALFUNCTIONS WERE EXCEPTIONALLY VAGUE AND WERE MISLEADING. WE USED THE WRONG CHKLIST INITIALLY; THEN; DUE TO TIME CONSTRAINTS; FINISHED IT PRIOR TO LNDG BUT DIDN'T HAVE TIME TO EXAMINE THE OTHER CHKLISTS; OR WE WOULD HAVE BEEN ABLE TO UNLOCK THE TRIM USING STABILIZER BRAKE RELEASE. CAPT FILED FLC SAFETY RPT WITH COMPANY TO ADDRESS V-LISTS; WAS INFORMED THEY WERE BEING REVISED DUE TO SIMILAR COMPLAINTS AND OBSERVATIONS.

Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.

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