Altitude bust. Reporters cite deviation from altitude resulted from no altitude alert system on aircraft as it was inoperative. First officer turned off mode C at top of altitude deviation.

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Attributes
ACN	131588
Time
Date	198912
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bna
State Reference	TN
Altitude	msl bound lower : 28000 msl bound upper : 30000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : prc
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute airway : j46
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 75 flight time total : 10000 flight time type : 1000
ASRS Report	131585
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 11800
ASRS Report	131527
Events
Anomaly	altitude deviation : excursion from assigned altitude altitude deviation : overshoot non adherence : clearance
Independent Detector	atc equipment other atc equipment : unspecified other controllera other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While climbing to cleared altitude of 28000', my attention was diverted while obtaining WX from FSS. The captain and PF climbed to 30000' before disconnecting autoplt and descending back to 28000'. At 30000' I turned off mode C. Note: we did not have an altitude capture function on our autoplt. Also,altitude alerter was inoperative. MEL allows dispatch west/O one. I feel this should be a grounding item since crews become dependent on this alert signal.

Original NASA ASRS Text

Title: ALT BUST. REPORTERS CITE DEVIATION FROM ALT RESULTED FROM NO ALT ALERT SYSTEM ON ACFT AS IT WAS INOPERATIVE. FO TURNED OFF MODE C AT TOP OF ALT DEVIATION.

Narrative: WHILE CLBING TO CLRED ALT OF 28000', MY ATTN WAS DIVERTED WHILE OBTAINING WX FROM FSS. THE CAPT AND PF CLBED TO 30000' BEFORE DISCONNECTING AUTOPLT AND DSNDING BACK TO 28000'. AT 30000' I TURNED OFF MODE C. NOTE: WE DID NOT HAVE AN ALT CAPTURE FUNCTION ON OUR AUTOPLT. ALSO,ALT ALERTER WAS INOP. MEL ALLOWS DISPATCH W/O ONE. I FEEL THIS SHOULD BE A GNDING ITEM SINCE CREWS BECOME DEPENDENT ON THIS ALERT SIGNAL.

Data retrieved from NASA's ASRS site as of August 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.