Status:	Final
Date:	13 JAN 1998
Time:	08:10 CST
Type:	Learjet 25B
Operator:	American Corporate Aviation
Registration:	N627WS
C/n / msn:	25-170
First flight:	1974
Total airframe hrs:	8943
Engines:	2 General Electric CJ610-6
Crew:	Fatalities: 2 / Occupants: 2
Passengers:	Fatalities: 0 / Occupants: 0
Total:	Fatalities: 2 / Occupants: 2
Airplane damage:	Written off
Airplane fate:	Written off (damaged beyond repair)
Location:	3,2 km (2 mls) E of Houston-George Bush Intercontinental Airport, TX (IAH) (United States of America)
Phase:	Approach (APR)
Nature:	Ferry/positioning
Departure airport:	Houston-William P. Hobby Airport, TX (HOU/KHOU), United States of America
Destination airport:	Houston-George Bush Intercontinental Airport, TX (IAH/KIAH), United States of America

Narrative:
Descended below the glideslope during the 2nd runway 26 approach, struck trees and crashed. The first officer's instruments were displaying a false full fly-down glideslope indication because of a failed amplifier in the navigation receiver.

PROBABLE CAUSE: "The flight crew's continued descent of the airplane below the glideslope and through the published decision height without visual contact with the runway environment. Also, when the captain encountered difficulty tracking the localizer course, his improper decision to continue the approach by transferring control to the first officer instead of executing a missed approach contributed to the cause. In addition, the following were factors to the accident: (1) American Corporate Aviation's failure to provide an airworthy airplane to the flight crew following maintenance, resulting in a false glideslope indication to the first officer; (2) the flight crew's failure to follow company crew coordination procedures, which called for approach briefings and altitude callouts; and (3) the lack of an FAA requirement for a ground proximity warning system on the airplane. "

Sources:
» NTSB