A B737-700 on approach at 2800 ft is advised to 'go missed approach.' autoplt was in the capture mode and would not respond to commands and it was necessary to hand fly aircraft, but overshot 5000 ft assigned altitude.

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Attributes
ACN	494841
Time
Date	200012
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sea.airport
State Reference	WA
Altitude	msl single value : 2800
Environment
Flight Conditions	IMC
Weather Elements	Rain Turbulence
Aircraft 1
Controlling Facilities	tracon : s46.tracon tower : ism.tower
Operator	common carrier : air carrier
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 16r other
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 4200 flight time type : 1700
ASRS Report	494841
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 150 flight time total : 10000 flight time type : 4500
ASRS Report	495318
Events
Anomaly	aircraft equipment problem : critical altitude deviation : overshoot non adherence : far non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : altimeter #1 + #2 other flight crewa other flight crewb other other : 3
Resolutory Action	flight crew : returned to assigned altitude
Consequence	Other
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

We were vectored to ILS runway 16R approach. We had localizer intercept and were cleared for the approach. Approximately 4 mi outside the OM we were told to go missed approach (we were at approximately 2800 ft), climb and maintain runway heading and climb to 5000 ft. The aircraft was in the capture mode and we were unable to get it to respond to any commands via the MCP. I disconnected the autoplt and autothrottles and was hand flying the aircraft. We were told to turn right to 190 degrees, and still the aircraft would not allow us to even use the heading bug. My attention as well as the captain's was diverted to solving the lack of automation response and I climbed to approximately 5500 ft. I then descended to 5000 ft. Approach control asked us to confirm leveling at 5000 ft. We recycled the navigation frequency and solved the problem and went around and landed normally.

Original NASA ASRS Text

Title: A B737-700 ON APCH AT 2800 FT IS ADVISED TO 'GO MISSED APCH.' AUTOPLT WAS IN THE CAPTURE MODE AND WOULD NOT RESPOND TO COMMANDS AND IT WAS NECESSARY TO HAND FLY ACFT, BUT OVERSHOT 5000 FT ASSIGNED ALT.

Narrative: WE WERE VECTORED TO ILS RWY 16R APCH. WE HAD LOC INTERCEPT AND WERE CLRED FOR THE APCH. APPROX 4 MI OUTSIDE THE OM WE WERE TOLD TO GO MISSED APCH (WE WERE AT APPROX 2800 FT), CLB AND MAINTAIN RWY HDG AND CLB TO 5000 FT. THE ACFT WAS IN THE CAPTURE MODE AND WE WERE UNABLE TO GET IT TO RESPOND TO ANY COMMANDS VIA THE MCP. I DISCONNECTED THE AUTOPLT AND AUTOTHROTTLES AND WAS HAND FLYING THE ACFT. WE WERE TOLD TO TURN R TO 190 DEGS, AND STILL THE ACFT WOULD NOT ALLOW US TO EVEN USE THE HDG BUG. MY ATTN AS WELL AS THE CAPT'S WAS DIVERTED TO SOLVING THE LACK OF AUTOMATION RESPONSE AND I CLBED TO APPROX 5500 FT. I THEN DSNDED TO 5000 FT. APCH CTL ASKED US TO CONFIRM LEVELING AT 5000 FT. WE RECYCLED THE NAV FREQ AND SOLVED THE PROB AND WENT AROUND AND LANDED NORMALLY.

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.