AN E120 CAPT RPTS THAT TKOF WAS ABORTED NEEDLESSLY; AFTER HE RECEIVED AN AUTOFEATHER WARNING. THIS WARNING WAS NOT A RESULT OF AN AUTOFEATHER SYS MALFUNCTION; BUT DUE TO SLOWER ENG ACCELERATION AND ITS RELATIONSHIP TO THE TKOF WARNING SYS. RPTR COMMENTS THAT THE FLC SHOULD HAVE A BETTER RESOURCE TO REF WHAT TO EXPECT WITH A DEFERRAL. FLC RESPONSE. TKOF ABORTED.

1996-06 · NASA ASRS report 339957

Date: 1996-06 · Aircraft: Brasilia EMB-120 All Series

Anomalies: aircraft-equipment-problem-less-severe|other-unspecified

Synopsis

AN E120 CAPT RPTS THAT TKOF WAS ABORTED NEEDLESSLY; AFTER HE RECEIVED AN AUTOFEATHER WARNING. THIS WARNING WAS NOT A RESULT OF AN AUTOFEATHER SYS MALFUNCTION; BUT DUE TO SLOWER ENG ACCELERATION AND ITS RELATIONSHIP TO THE TKOF WARNING SYS. RPTR COMMENTS THAT THE FLC SHOULD HAVE A BETTER RESOURCE TO REF WHAT TO EXPECT WITH A DEFERRAL. FLC RESPONSE. TKOF ABORTED.

Narrative

ABORTED TKOF WHEN WE GOT THE TKOF AUTOFEATHER WARNING. DURING THE ROLLOUT I REALIZED THE EEC (ELECTRONIC ENG CTL) WAS DEFERRED AND CAN CAUSE THIS WARNING DUE TO SLOW ENG SPOOL-UP. I HAD BRIEFED THE FO OF THREE OTHER CONSIDERATIONS/LIMITATIONS THAT WE NEEDED TO KEEP IN MIND DUE TO THE DEFERRAL; BUT I FORGOT THIS ONE. THE VARIOUS ISSUES ARE ADDRESSED IN 3 SEPARATE LOCATIONS IN 2 BOOKS; AND THIS WARNING IS NOT WRITTEN ANYWHERE. IT WOULD BE A GOOD IDEA FOR THE ABNORMAL SECTION OF THE PLT OPERATING HANDBOOK TO INCLUDE A SHORT LIST OF CONSIDERATIONS FOR EACH MALFUNCTION. IT MAY STILL BE NECESSARY TO REFER TO THE OTHER PUBS; BUT IT WOULD BE A GOOD PLACE TO START THE BRIEFING TO ENSURE ALL THE BASES ARE COVERED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE THREE FLC CONSIDERATIONS FOR OPS WITH THE EEC DEFERRED (BRIEFED BY RPTR BEFORE TKOF) WERE: FLT ALT LIMITATIONS; RWY ANALYSIS; AND ABNORMAL PROCS. INFO ABOUT THE ALT LIMITATION IS FOUND IN THE LIMITATIONS SECTION OF THE PLT OPS HANDBOOK; FLT ABOVE FL250 IS PROHIBITED AND FLT ABOVE FL200 REQUIRES BOTH BLEEDS TO BE OPEN. A SEPARATE RWY ANALYSIS MANUAL COULD CONTAIN A WT PENALTY DEPENDING UPON THE OUTSIDE AIR TEMP. THE PLT OPS HANDBOOK ABNORMAL SECTION WARNS THE PLT NOT TO REDUCE PWR BELOW 20 PERCENT DURING DSCNT AND TO ANTICIPATE LITTLE; IF ANY; REVERSE THRUST DURING LNDG DECELERATION. THE AUTOFEATHER WARNING WAS NOT SOMETHING THAT THE CAPT INITIALLY THOUGHT ABOUT. THIS WARNING IS PART OF THE TKOF WARNING SYS WHICH CHKS BRAKE RELEASE; FLAP SETTING; TRIM; AND AUTOFEATHER. ONE OF THE TWO PARAMETERS FOR THIS SYS DID NOT MEET MINIMUM REQUIREMENTS. THE THROTTLE REACHED THE 62 DEG ANGLE; BUT THE ENG TORQUE HAD NOT MADE 62 PERCENT PWR; THUS CAUSING THE AUTOFEATHER WARNING. THE AUTOFEATHER WARNING WAS SIMPLY A WARNING THAT THE AUTOFEATHER WAS NOT ARMED. THIS CAPT HAS NOW LISTED THESE CONSIDERATIONS AND LIMITATIONS; AND MARKED THEIR LOCATION IN HIS PLT OPS HANDBOOK; BUT FEELS IT WOULD BE HELPFUL TO OTHERS IF THIS INFO WAS READILY AVAILABLE SO THAT OTHERS DID NOT FIND THEMSELVES IN THE SAME SIT.

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

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