<< >> NASA ASRS Report 595798, October 2003

Leaving 700 ft on an ILS to dfw runway 17C, it is apparent that the aircraft is not lined up with the runway and a go around is made. Unsubstantiated interference with aircraft instruments by an unauthorized onboard passenger electronic device is suspected.

Attributes
ACN	595798
Time
Date	200310
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	agl single value : 700
Environment
Flight Conditions	IMC
Aircraft 1
Controlling Facilities	tower : dfw.tower
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 17c
Flight Phase	descent : approach landing : missed approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : multi engine pilot : instrument
ASRS Report	595798
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	595804
Events
Anomaly	cabin event : passenger misconduct non adherence : far other spatial deviation
Independent Detector	other controllera other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : executed go around
Consequence	other
Supplementary
Problem Areas	Aircraft Passenger Human Performance
Primary Problem	Ambiguous

Narrative:

On final approach to runway 17C, with the captain flying the aircraft, I obtained ground contact for the first time at approximately 400-500 ft. The approach had been -- uneventful until we broke out -- I could see that we were lined up between runway 17C and runway 17R. At that moment the tower told us to go around. After we leveled off and were downwind the captain said that his flight director was giving him steady guidance until right before the go around command, when he noticed the CDI offset to the left. The command bars then retracted and did not come down until the autoplt was switched to #2. Before going outside to pick up the runway, I did not notice anything wrong with the instruments on my side. I flew the remaining approach and landing without any problems noted. On the ground we asked the #1 flight attendant if she had observed anyone operating any electronic devices. She did not see anyone.

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Original NASA ASRS Text

Title: LEAVING 700 FT ON AN ILS TO DFW RWY 17C, IT IS APPARENT THAT THE ACFT IS NOT LINED UP WITH THE RWY AND A GAR IS MADE. UNSUBSTANTIATED INTERFERENCE WITH ACFT INSTS BY AN UNAUTH ONBOARD PAX ELECTRONIC DEVICE IS SUSPECTED.

Narrative: ON FINAL APCH TO RWY 17C, WITH THE CAPT FLYING THE ACFT, I OBTAINED GND CONTACT FOR THE FIRST TIME AT APPROX 400-500 FT. THE APCH HAD BEEN -- UNEVENTFUL UNTIL WE BROKE OUT -- I COULD SEE THAT WE WERE LINED UP BTWN RWY 17C AND RWY 17R. AT THAT MOMENT THE TWR TOLD US TO GO AROUND. AFTER WE LEVELED OFF AND WERE DOWNWIND THE CAPT SAID THAT HIS FLT DIRECTOR WAS GIVING HIM STEADY GUIDANCE UNTIL RIGHT BEFORE THE GAR COMMAND, WHEN HE NOTICED THE CDI OFFSET TO THE L. THE COMMAND BARS THEN RETRACTED AND DID NOT COME DOWN UNTIL THE AUTOPLT WAS SWITCHED TO #2. BEFORE GOING OUTSIDE TO PICK UP THE RWY, I DID NOT NOTICE ANYTHING WRONG WITH THE INSTS ON MY SIDE. I FLEW THE REMAINING APCH AND LNDG WITHOUT ANY PROBS NOTED. ON THE GND WE ASKED THE #1 FLT ATTENDANT IF SHE HAD OBSERVED ANYONE OPERATING ANY ELECTRONIC DEVICES. SHE DID NOT SEE ANYONE.

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.