Air carrier medium large transport track heading deviation during IAP ILS approach to runway 36L at clt. Multiple runways parallel approach were in progress at the time.

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Attributes
ACN	200361
Time
Date	199201
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : clt
State Reference	NC
Altitude	msl bound lower : 4100 msl bound upper : 4100
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : clt
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 12000 flight time type : 4000
ASRS Report	200361
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe non adherence : published procedure non adherence : clearance other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance 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:

While executing the ILS to 36L clt, due to a distraction I deviated slightly from the localizer course. We had just been cleared for the approach. At time of localizer interception we experienced a ruptured duct in the cockpit pack. This created a very loud noise in the cockpit. It was so loud that we had to shout to be heard. My first instinct was to keep the airplane straight and level to try to indent the problem. Once I determined the problem which was the cockpit pack I noticed I was a half DOT off the localizer. Unfortunately it was to the right towards the parallel ILS 36R. The controller gave us instructions to turn and rejoin but I had already initiated the turn back on course. This incident was totally unintentional and was a result of the mechanical problems experienced.

Original NASA ASRS Text

Title: ACR MLG TRACK HDG DEV DURING IAP ILS APCH TO RWY 36L AT CLT. MULTIPLE RWYS PARALLEL APCH WERE IN PROGRESS AT THE TIME.

Narrative: WHILE EXECUTING THE ILS TO 36L CLT, DUE TO A DISTR I DEVIATED SLIGHTLY FROM THE LOC COURSE. WE HAD JUST BEEN CLRED FOR THE APCH. AT TIME OF LOC INTERCEPTION WE EXPERIENCED A RUPTURED DUCT IN THE COCKPIT PACK. THIS CREATED A VERY LOUD NOISE IN THE COCKPIT. IT WAS SO LOUD THAT WE HAD TO SHOUT TO BE HEARD. MY FIRST INSTINCT WAS TO KEEP THE AIRPLANE STRAIGHT AND LEVEL TO TRY TO INDENT THE PROBLEM. ONCE I DETERMINED THE PROBLEM WHICH WAS THE COCKPIT PACK I NOTICED I WAS A HALF DOT OFF THE LOC. UNFORTUNATELY IT WAS TO THE R TOWARDS THE PARALLEL ILS 36R. THE CTLR GAVE US INSTRUCTIONS TO TURN AND REJOIN BUT I HAD ALREADY INITIATED THE TURN BACK ON COURSE. THIS INCIDENT WAS TOTALLY UNINTENTIONAL AND WAS A RESULT OF THE MECHANICAL PROBLEMS EXPERIENCED.

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.