<< >> NASA ASRS Report 699716, June 2006

B737-700 flight crew has aircraft perform uncommanded pitch up while on ILS with localizer captured at sna.

Attributes
ACN	699716
Time
Date	200606
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sna.airport
State Reference	CA
Altitude	msl single value : 3000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tower : sna.tower
Operator	common carrier : air carrier
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 16000
ASRS Report	699716
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
ASRS Report	699717
Events
Anomaly	aircraft equipment problem : critical non adherence : clearance
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : overrode automation
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Being vectored for an approach to ILS runway 19R in sna heading 170 degrees to intercept the localizer for ILS approach. Upon localizer capture with approach mode armed; autoplt and autothrottle on; the aircraft suddenly turned sharply in a 30 degree bank to join the localizer. After localizer capture at 3000 ft level and the aircraft on autoplt and autothrottles engaged; the thrust suddenly increased and the aircraft pitched up in a climb similar to a toga event. The flight mode annunciation was 'MCP speed;' VOR/localizer; and altitude hold. Aircraft climbed to about 3300 ft before the captain disconnected the autoplt and proceeded to fly a manual ILS to recapture the GS and localizer in instrument conditions (IMC). Aircraft broke out at about 800 ft AGL and landed normally.

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Original NASA ASRS Text

Title: B737-700 FLT CREW HAS ACFT PERFORM UNCOMMANDED PITCH UP WHILE ON ILS WITH LOC CAPTURED AT SNA.

Narrative: BEING VECTORED FOR AN APCH TO ILS RWY 19R IN SNA HDG 170 DEGS TO INTERCEPT THE LOC FOR ILS APCH. UPON LOC CAPTURE WITH APCH MODE ARMED; AUTOPLT AND AUTOTHROTTLE ON; THE ACFT SUDDENLY TURNED SHARPLY IN A 30 DEG BANK TO JOIN THE LOC. AFTER LOC CAPTURE AT 3000 FT LEVEL AND THE ACFT ON AUTOPLT AND AUTOTHROTTLES ENGAGED; THE THRUST SUDDENLY INCREASED AND THE ACFT PITCHED UP IN A CLB SIMILAR TO A TOGA EVENT. THE FLT MODE ANNUNCIATION WAS 'MCP SPD;' VOR/LOC; AND ALT HOLD. ACFT CLBED TO ABOUT 3300 FT BEFORE THE CAPT DISCONNECTED THE AUTOPLT AND PROCEEDED TO FLY A MANUAL ILS TO RECAPTURE THE GS AND LOC IN INST CONDITIONS (IMC). ACFT BROKE OUT AT ABOUT 800 FT AGL AND LANDED NORMALLY.

Data retrieved from NASA's ASRS site as of January 2009 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.