Flight crew climbed through assigned altitude.

Attributes
ACN	321951
Time
Date	199511
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : cty
State Reference	FL
Altitude	msl bound lower : 28000 msl bound upper : 28400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 6000 flight time type : 2500
ASRS Report	321951
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 110 flight time total : 6600
ASRS Report	322310
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Climbing to FL280, received clearance from vector to proceed direct to cty. While turning to proceed direct, noticed a significant difference between omega heading of #1 and #2 omega and VOR heading. This occurred while approaching FL280. Altitude alerter sounded as we passed through FL283. I took control of the aircraft and disconnected the autoplt and began to correct to FL280. Total altitude deviation did not exceed FL284. The reason for the occurrence was the distraction caused by the disagreement in the navigation system.

Original NASA ASRS Text

Title: FLC CLBED THROUGH ASSIGNED ALT.

Narrative: CLBING TO FL280, RECEIVED CLRNC FROM VECTOR TO PROCEED DIRECT TO CTY. WHILE TURNING TO PROCEED DIRECT, NOTICED A SIGNIFICANT DIFFERENCE BTWN OMEGA HDG OF #1 AND #2 OMEGA AND VOR HDG. THIS OCCURRED WHILE APCHING FL280. ALT ALERTER SOUNDED AS WE PASSED THROUGH FL283. I TOOK CTL OF THE ACFT AND DISCONNECTED THE AUTOPLT AND BEGAN TO CORRECT TO FL280. TOTAL ALTDEV DID NOT EXCEED FL284. THE REASON FOR THE OCCURRENCE WAS THE DISTR CAUSED BY THE DISAGREEMENT IN THE NAV SYS.

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.