<< >> NASA ASRS Report 658656, May 2005

A LR45 pilot reports the autoplt altitude capture failed to capture the initial 1500 ft altitude because of the aircraft climb rate on the teb 5 departure.

Attributes
ACN	658656
Time
Date	200505
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : teb.airport
State Reference	NJ
Altitude	msl single value : 1500
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : n90.tracon
Operator	common carrier : air carrier
Make Model Name	Learjet 45
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Route In Use	departure sid : teb 5
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 90 flight time total : 2900 flight time type : 1000
ASRS Report	658656
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	airspace violation : entry altitude deviation : crossing restriction not met altitude deviation : excursion from assigned altitude altitude deviation : overshoot non adherence : published procedure non adherence : far non adherence : clearance
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued alert flight crew : returned to assigned altitude
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft Airspace Structure
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation
Situations
Chart	sid : teb 5

Narrative:

Departed south from runway 24 on the teb 5 departure. Altitude preselect was set to 1500 ft. During takeoff autoplt was engaged at approximately 800 ft MSL. The heading bug was then turned to 280 degrees as per the departure. While configuring the heading the altitude is reaching leveloff of 1500 ft MSL. Since the aircraft was climbing at 1800-2000 ft per minute the autoplt could not react quick enough to level at 1500 ft MSL. The autoplt did attempt to level off approximately 1750 ft MSL; which is over the 1500 ft prescribed. At this point the autoplt was manually disconnected and an attempt was made to descend back down to 1500 ft MSL. During this exact moment the controller was questioning our altitude and we reported 1700 ft MSL.

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Original NASA ASRS Text

Title: A LR45 PLT RPTS THE AUTOPLT ALT CAPTURE FAILED TO CAPTURE THE INITIAL 1500 FT ALT BECAUSE OF THE ACFT CLB RATE ON THE TEB 5 DEP.

Narrative: DEPARTED S FROM RWY 24 ON THE TEB 5 DEP. ALT PRESELECT WAS SET TO 1500 FT. DURING TKOF AUTOPLT WAS ENGAGED AT APPROX 800 FT MSL. THE HDG BUG WAS THEN TURNED TO 280 DEGS AS PER THE DEP. WHILE CONFIGURING THE HDG THE ALT IS REACHING LEVELOFF OF 1500 FT MSL. SINCE THE ACFT WAS CLBING AT 1800-2000 FT PER MINUTE THE AUTOPLT COULD NOT REACT QUICK ENOUGH TO LEVEL AT 1500 FT MSL. THE AUTOPLT DID ATTEMPT TO LEVEL OFF APPROX 1750 FT MSL; WHICH IS OVER THE 1500 FT PRESCRIBED. AT THIS POINT THE AUTOPLT WAS MANUALLY DISCONNECTED AND AN ATTEMPT WAS MADE TO DSND BACK DOWN TO 1500 FT MSL. DURING THIS EXACT MOMENT THE CTLR WAS QUESTIONING OUR ALT AND WE RPTED 1700 FT MSL.

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.