Flight crew of JS41 experience a faulty gear safe warning system on arrival at cvg. Fail to make a l...

Attributes
ACN	617431
Time
Date	200405
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : stl.airport
State Reference	MO
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : stl.tower
Operator	common carrier : air carrier
Make Model Name	Jetstream 41
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : cfi
Experience	flight time last 90 days : 200 flight time total : 2200 flight time type : 718
ASRS Report	617431
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper documentation non adherence : company policies non adherence : published procedure non adherence : far
Independent Detector	aircraft equipment other aircraft equipment : gear safe indicator other flight crewa
Resolutory Action	flight crew : landed in emergency condition flight crew : declared emergency
Consequence	other other
Factors
Maintenance	performance deficiency : logbook entry performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Maintenance Human Performance Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

On landing at cvg, the main right gear indicator did not show down. We verified all gear were down by using the standby gear position indicator. On departure from cvg the next day, when the gear was selected up, the standby gear indicator still showed the right main landing gear as down. Because of discrepancy, we were not sure if the gear was up or down. We did 'recycle' the gear but had the same indication. Upon selecting gear down when landing at stl, the main indicator still did not work and the standby showed all 3 gear down. Because the right main landing gear on the standby indicator had been on the entire flight, we made a low pass for the tower to observe the gear visually. When confirmed all gear were down, we came around back to landing without any incidents. As a precautionary measure, we called for emergency vehicles to follow us down the runway. We also advised the flight attendant of a possible evacuate/evacuation and also briefed the passenger a number of times. Callback conversation with reporter revealed the following information: following the initial failure, the reporter departed the airplane immediately upon gate arrival for physiological reasons. He left with the understanding the captain would make the appropriate write-ups in the maintenance log. The following day, the reporter advised the crew returned to the same aircraft and the captain performed the cockpit setup while the reporter did the external walkaround. Reporter advised that since the cockpit preflight was not his responsibility, he only discovered the lack of maintenance action and the on going anomaly upon receiving inappropriate indications on both the normal and standby gear warning system after gear retraction on takeoff.

Original NASA ASRS Text

Title: FLT CREW OF JS41 EXPERIENCE A FAULTY GEAR SAFE WARNING SYS ON ARR AT CVG. FAIL TO MAKE A LOGBOOK ENTRY YET FLY THE SAME ACFT THE FOLLOWING DAY AND NEED TO DECLARE AN EMER WHEN THE STANDBY WARNING SYS MALFUNCTIONED AS WELL.

Narrative: ON LNDG AT CVG, THE MAIN R GEAR INDICATOR DID NOT SHOW DOWN. WE VERIFIED ALL GEAR WERE DOWN BY USING THE STANDBY GEAR POS INDICATOR. ON DEP FROM CVG THE NEXT DAY, WHEN THE GEAR WAS SELECTED UP, THE STANDBY GEAR INDICATOR STILL SHOWED THE R MAIN LNDG GEAR AS DOWN. BECAUSE OF DISCREPANCY, WE WERE NOT SURE IF THE GEAR WAS UP OR DOWN. WE DID 'RECYCLE' THE GEAR BUT HAD THE SAME INDICATION. UPON SELECTING GEAR DOWN WHEN LNDG AT STL, THE MAIN INDICATOR STILL DID NOT WORK AND THE STANDBY SHOWED ALL 3 GEAR DOWN. BECAUSE THE R MAIN LNDG GEAR ON THE STANDBY INDICATOR HAD BEEN ON THE ENTIRE FLT, WE MADE A LOW PASS FOR THE TWR TO OBSERVE THE GEAR VISUALLY. WHEN CONFIRMED ALL GEAR WERE DOWN, WE CAME AROUND BACK TO LNDG WITHOUT ANY INCIDENTS. AS A PRECAUTIONARY MEASURE, WE CALLED FOR EMER VEHICLES TO FOLLOW US DOWN THE RWY. WE ALSO ADVISED THE FLT ATTENDANT OF A POSSIBLE EVAC AND ALSO BRIEFED THE PAX A NUMBER OF TIMES. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: FOLLOWING THE INITIAL FAILURE, THE RPTR DEPARTED THE AIRPLANE IMMEDIATELY UPON GATE ARR FOR PHYSIOLOGICAL REASONS. HE LEFT WITH THE UNDERSTANDING THE CAPT WOULD MAKE THE APPROPRIATE WRITE-UPS IN THE MAINT LOG. THE FOLLOWING DAY, THE RPTR ADVISED THE CREW RETURNED TO THE SAME ACFT AND THE CAPT PERFORMED THE COCKPIT SETUP WHILE THE RPTR DID THE EXTERNAL WALKAROUND. RPTR ADVISED THAT SINCE THE COCKPIT PREFLT WAS NOT HIS RESPONSIBILITY, HE ONLY DISCOVERED THE LACK OF MAINT ACTION AND THE ON GOING ANOMALY UPON RECEIVING INAPPROPRIATE INDICATIONS ON BOTH THE NORMAL AND STANDBY GEAR WARNING SYS AFTER GEAR RETRACTION ON TKOF.

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.

Flight crew of JS41 experience a faulty gear safe warning system on arrival at cvg. Fail to make a logbook entry yet fly the same aircraft the following day and need to declare an emergency when the standby warning system malfunctioned as well.