Lear 25B aircraft departs with thrust reverser arm light activated.

Attributes
ACN	336430
Time
Date	199605
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : yip
State Reference	MI
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tower : yip
Operator	common carrier : air taxi
Make Model Name	Learjet 25
Operating Under FAR Part	Part 135
Flight Phase	climbout : takeoff ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 200 flight time total : 4600 flight time type : 850
ASRS Report	336430
Person 2
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Upon taxi out for departure at yip, I observed an arm light illuminated on the left thrust reverser. After several attempts to extinguish the light I determined that it was a failure in the light switch. This airplane had such a problem in the past. Because of pressures by various company employees, ie, dispatchers, etc, to get the plane back to base for pending trips, I departed with the light illuminated. The light went out during climb out and remained out until our descent into pie. A landing was made uneventfully. Upon inspection it was noted that the inboard thrust reverser latch was in the unlock position. The latch was blocked by an improperly installed engine cowling. Contributing factors: 1) company's constant pressures to get the aircraft back to base after several delays in michigan for maintenance. 2) having had problems with the arm switch in the past (faulty indication). 3) company's past lack of concern for addressing discrepancies. Aircraft concerned: lear jet 25B.

Original NASA ASRS Text

Title: LEAR 25B ACFT DEPARTS WITH THRUST REVERSER ARM LIGHT ACTIVATED.

Narrative: UPON TAXI OUT FOR DEP AT YIP, I OBSERVED AN ARM LIGHT ILLUMINATED ON THE L THRUST REVERSER. AFTER SEVERAL ATTEMPTS TO EXTINGUISH THE LIGHT I DETERMINED THAT IT WAS A FAILURE IN THE LIGHT SWITCH. THIS AIRPLANE HAD SUCH A PROB IN THE PAST. BECAUSE OF PRESSURES BY VARIOUS COMPANY EMPLOYEES, IE, DISPATCHERS, ETC, TO GET THE PLANE BACK TO BASE FOR PENDING TRIPS, I DEPARTED WITH THE LIGHT ILLUMINATED. THE LIGHT WENT OUT DURING CLBOUT AND REMAINED OUT UNTIL OUR DSCNT INTO PIE. A LNDG WAS MADE UNEVENTFULLY. UPON INSPECTION IT WAS NOTED THAT THE INBOARD THRUST REVERSER LATCH WAS IN THE UNLOCK POS. THE LATCH WAS BLOCKED BY AN IMPROPERLY INSTALLED ENG COWLING. CONTRIBUTING FACTORS: 1) COMPANY'S CONSTANT PRESSURES TO GET THE ACFT BACK TO BASE AFTER SEVERAL DELAYS IN MICHIGAN FOR MAINT. 2) HAVING HAD PROBS WITH THE ARM SWITCH IN THE PAST (FAULTY INDICATION). 3) COMPANY'S PAST LACK OF CONCERN FOR ADDRESSING DISCREPANCIES. ACFT CONCERNED: LEAR JET 25B.

Data retrieved from NASA's ASRS site as of July 2007 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.