G150 captain reports seat moving aft as level off at assigned altitude is attempted; causing an over...

Attributes
ACN	919864
Time
Date	201011
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	Gulfstream G100/G150 (IAI 1125 Astra)
Operating Under FAR Part	Part 91
Flight Phase	Initial Climb
Flight Plan	IFR
Component
Aircraft Component	Pilot Seat
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 60 Flight Crew Total 21000 Flight Crew Type 140
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Altitude Overshoot Deviation - Procedural Clearance

Narrative:

Initial altitude clearance limit was 5;000 ft. During climb and approaching level off (approximately 4;700 with high climb rate; hand flying) pilot seat suddenly slid aft 2-3 inches causing temporary partial loss of pitch control and inadvertent altitude overshoot of 2-300 ft. Higher climb limit was given in process of level off. Aircraft had been in maintenance and seat (and rudder pedals) apparently adjusted by maintenance personnel (for taxi). After resuming climb (auto pilot on) seat was readjusted and found seat track lock lever sticking in unlatched position (spring loaded to latch). Caution will be taken to ensure latch goes to latch position in future.

Original NASA ASRS Text

Title: G150 Captain reports seat moving aft as level off at assigned altitude is attempted; causing an overshoot. Spring loaded seat locking lever was found sticking in the unlatched position.

Narrative: Initial altitude clearance limit was 5;000 FT. During climb and approaching level off (approximately 4;700 with high climb rate; hand flying) pilot seat suddenly slid aft 2-3 inches causing temporary partial loss of pitch control and inadvertent altitude overshoot of 2-300 FT. Higher climb limit was given in process of level off. Aircraft had been in maintenance and seat (and rudder pedals) apparently adjusted by maintenance personnel (for taxi). After resuming climb (auto pilot on) seat was readjusted and found seat track lock lever sticking in unlatched position (spring loaded to latch). Caution will be taken to ensure latch goes to latch position in future.

Data retrieved from NASA's ASRS site as of April 2012 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.

G150 captain reports seat moving aft as level off at assigned altitude is attempted; causing an overshoot. Spring loaded seat locking lever was found sticking in the unlatched position.