<< >> NASA ASRS Report 1708164, December 2019

Medium transport captain reported that during final ILS runway 19 approach to teb and established on the localizer with autopilot engaged the aircraft pitched up unexpectedly. Captain stated this is a known problem at this location by the airport community.

Attributes
ACN	1708164
Time
Date	201912
Local Time Of Day	1801-2400
Place
Locale Reference	TEB.Airport
State Reference	NJ
Environment
Light	Dusk
Aircraft 1
Make Model Name	Medium Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Direct
Flight Plan	IFR
Person 1
Function	Captain Check Pilot Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 60 Flight Crew Total 11000 Flight Crew Type 500
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Published Material / Policy Inflight Event / Encounter Unstabilized Approach

Narrative:

While on the ILS runway 19 teb we were established on the localizer inside of tuggz and were cleared for the ILS approach. We were level at 2;000 feet with the autopilot engaged. As the glideslope captured the aircraft made an abrupt climb. A correction was made to prevent continued climb on the glideslope and the aircraft followed a visual path backed up by the localizer. The climbing action was sudden and unexpected. We queried the controller on the unexpected deviation in the glideslope and explained what had occurred. Further reading on this subject reveals that it is a known problem at teterboro and is well known by the teterboro users group. I feel given the severity of glideslope deviation and the high likely hood of occurrence that this needs to be addressed.

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Original NASA ASRS Text

Title: Medium transport Captain reported that during final ILS Runway 19 approach to TEB and established on the localizer with autopilot engaged the aircraft pitched up unexpectedly. Captain stated this is a known problem at this location by the airport community.

Narrative: While on the ILS Runway 19 TEB we were established on the localizer inside of TUGGZ and were cleared for the ILS approach. We were level at 2;000 feet with the autopilot engaged. As the glideslope captured the aircraft made an abrupt climb. A correction was made to prevent continued climb on the glideslope and the aircraft followed a visual path backed up by the localizer. The climbing action was sudden and unexpected. We queried the Controller on the unexpected deviation in the glideslope and explained what had occurred. Further reading on this subject reveals that it is a known problem at Teterboro and is well known by the Teterboro users group. I feel given the severity of glideslope deviation and the high likely hood of occurrence that this needs to be addressed.

Data retrieved from NASA's ASRS site 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.