Altitude deviation during cruise level off.

Attributes
ACN	316150
Time
Date	199509
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ord
State Reference	IL
Altitude	msl bound lower : 25700 msl bound upper : 26400
Aircraft 1
Controlling Facilities	artcc : zau
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	316150
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
ASRS Report	316394
Events
Anomaly	altitude deviation : overshoot non adherence : far non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem flight crew : returned to intended course or assigned course flight crew : regained aircraft control
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Aircraft climbing with autoplt engaged. Approaching FL260 altitude capture displayed on FMA. Flew through FL260. Copilot's leg. He recognized the problem, disconnected the autoplt, and hand flew back to FL260. Maximum altitude 26400 ft. Minimum altitude 25700 ft during recovery. Copilot recognized the problem and reacted in a timely and appropriate manner. Good catch. Supplemental information from acn 316394: descended back down to FL257 and eased back up to FL260. Reengaged autoplt and monitored closely the rest of flight. We also got an aural warning of a slat overspd when aircraft was passing FL260 on climb and another one when we leveled off at FL260 in cruise flight. Airspeed both times of warning was .780 mach. No further problems were encountered for rest of flight.

Original NASA ASRS Text

Title: ALTDEV DURING CRUISE LEVEL OFF.

Narrative: ACFT CLBING WITH AUTOPLT ENGAGED. APCHING FL260 ALT CAPTURE DISPLAYED ON FMA. FLEW THROUGH FL260. COPLT'S LEG. HE RECOGNIZED THE PROB, DISCONNECTED THE AUTOPLT, AND HAND FLEW BACK TO FL260. MAX ALT 26400 FT. MINIMUM ALT 25700 FT DURING RECOVERY. COPLT RECOGNIZED THE PROB AND REACTED IN A TIMELY AND APPROPRIATE MANNER. GOOD CATCH. SUPPLEMENTAL INFO FROM ACN 316394: DSNDED BACK DOWN TO FL257 AND EASED BACK UP TO FL260. REENGAGED AUTOPLT AND MONITORED CLOSELY THE REST OF FLT. WE ALSO GOT AN AURAL WARNING OF A SLAT OVERSPD WHEN ACFT WAS PASSING FL260 ON CLB AND ANOTHER ONE WHEN WE LEVELED OFF AT FL260 IN CRUISE FLT. AIRSPD BOTH TIMES OF WARNING WAS .780 MACH. NO FURTHER PROBS WERE ENCOUNTERED FOR REST OF FLT.

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.