Air carrier flight crew overshot clearance altitude during climb while autoplt and FMS were engaged.

Attributes
ACN	314310
Time
Date	199508
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : crg
State Reference	FL
Altitude	msl bound lower : 27000 msl bound upper : 27400
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
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 : first officer
Qualification	pilot : commercial pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 210 flight time total : 4000 flight time type : 210
ASRS Report	314310
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : atp pilot : instrument pilot : flight engineer
Experience	flight time last 90 days : 120 flight time total : 8000 flight time type : 1500
ASRS Report	314234
Events
Anomaly	altitude deviation : overshoot non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Assigned FL270. Climbing through FL265 selected FMS override to .80 mach. Autoplt was engaged. Altitude alert prior to level off sounded and 1000 ft to go callouts were made. Aircraft did not capture altitude. Autoplt was disengaged and aircraft was hand flown back to FL270. Highest altitude was FL274. Autoplt was re-engaged with no further incident. Supplemental information from acn 314234: climbing through FL265 the first officer announced he was going to accelerate to mach .80 (we had a line of WX ahead of us and center had said to expect higher north of crg VOR). He hoped to zoom over the WX when cleared by center. The aircraft did not capture the altitude. The autoplt/FMS must have been confused with the change of speed modes in the climb.

Original NASA ASRS Text

Title: ACR FLC OVERSHOT CLRNC ALT DURING CLB WHILE AUTOPLT AND FMS WERE ENGAGED.

Narrative: ASSIGNED FL270. CLBING THROUGH FL265 SELECTED FMS OVERRIDE TO .80 MACH. AUTOPLT WAS ENGAGED. ALT ALERT PRIOR TO LEVEL OFF SOUNDED AND 1000 FT TO GO CALLOUTS WERE MADE. ACFT DID NOT CAPTURE ALT. AUTOPLT WAS DISENGAGED AND ACFT WAS HAND FLOWN BACK TO FL270. HIGHEST ALT WAS FL274. AUTOPLT WAS RE-ENGAGED WITH NO FURTHER INCIDENT. SUPPLEMENTAL INFO FROM ACN 314234: CLBING THROUGH FL265 THE FO ANNOUNCED HE WAS GOING TO ACCELERATE TO MACH .80 (WE HAD A LINE OF WX AHEAD OF US AND CTR HAD SAID TO EXPECT HIGHER N OF CRG VOR). HE HOPED TO ZOOM OVER THE WX WHEN CLRED BY CTR. THE ACFT DID NOT CAPTURE THE ALT. THE AUTOPLT/FMS MUST HAVE BEEN CONFUSED WITH THE CHANGE OF SPD MODES IN THE CLB.

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.