Air carrier captain reports hard pitch-up at glideslope intercept on runway 08R at eddm.

Attributes
ACN	758614
Time
Date	200710
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : eddm.airport
State Reference	FO
Altitude	msl single value : 3500
Environment
Flight Conditions	IMC
Aircraft 1
Controlling Facilities	tracon : eddm.tracon tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	Widebody Transport
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 8r
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 220 flight time total : 17000 flight time type : 525
ASRS Report	758614
Events
Anomaly	altitude deviation : excursion from assigned altitude other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended or assigned course
Supplementary
Problem Areas	Navigational Facility
Primary Problem	Navigational Facility
Situations
Navigational Aid	EDDM.ILS

Narrative:

IMC and IFR; cleared for ILS runway 08R approach. Briefing included comments by first officer that he had experienced an uncommanded pitch-up at glideslope capture on numerous occasions -- more often than not -- on this approach. Localizer capture was normal; autoplt on; and we were below glideslope on altitude hold at 3000 ft MSL. As glideslope intercept; aircraft pitched hard nose up -- estimate 1.3-1.5 G's -- and began an aggressive climb up away from glideslope. Autoplt did not disconnect; so I disconnected; maneuvered back down onto glideslope; stabilized; and reconnected autoplt with no abnormal indications or maneuvers. Remainder of flight was uneventful until parking at gate. At no time were stabilized approach parameters or limits exceeded. Safety concern is that this phenomenon has occurred on numerous occasions; but is not noted in any commercial chart data; and may not have been reported by other crews. Do not know whether it is airline-specific; but it is not aircraft-specific within the fleet at company.

Original NASA ASRS Text

Title: ACR CAPT REPORTS HARD PITCH-UP AT GLIDESLOPE INTERCEPT ON RWY 08R AT EDDM.

Narrative: IMC AND IFR; CLEARED FOR ILS RWY 08R APPROACH. BRIEFING INCLUDED COMMENTS BY FO THAT HE HAD EXPERIENCED AN UNCOMMANDED PITCH-UP AT GLIDESLOPE CAPTURE ON NUMEROUS OCCASIONS -- MORE OFTEN THAN NOT -- ON THIS APPROACH. LOCALIZER CAPTURE WAS NORMAL; AUTOPLT ON; AND WE WERE BELOW GLIDESLOPE ON ALT HOLD AT 3000 FT MSL. AS GLIDESLOPE INTERCEPT; AIRCRAFT PITCHED HARD NOSE UP -- ESTIMATE 1.3-1.5 G'S -- AND BEGAN AN AGGRESSIVE CLIMB UP AWAY FROM GLIDESLOPE. AUTOPLT DID NOT DISCONNECT; SO I DISCONNECTED; MANEUVERED BACK DOWN ONTO GLIDESLOPE; STABILIZED; AND RECONNECTED AUTOPLT WITH NO ABNORMAL INDICATIONS OR MANEUVERS. REMAINDER OF FLIGHT WAS UNEVENTFUL UNTIL PARKING AT GATE. AT NO TIME WERE STABILIZED APPROACH PARAMETERS OR LIMITS EXCEEDED. SAFETY CONCERN IS THAT THIS PHENOMENON HAS OCCURRED ON NUMEROUS OCCASIONS; BUT IS NOT NOTED IN ANY COMMERCIAL CHART DATA; AND MAY NOT HAVE BEEN REPORTED BY OTHER CREWS. DO NOT KNOW WHETHER IT IS AIRLINE-SPECIFIC; BUT IT IS NOT AIRCRAFT-SPECIFIC WITHIN THE FLEET AT COMPANY.

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.