A mechanic reports he repaired an emergency exit lens cover that had a 45 degree directional arrow o...

Narrative:

I was walking thru a dhc-8-300; aircraft X and noticed that the right-hand aft emergency exit lens cover was not secured on the aft side. I removed the lens and saw that the aft clip that holds it in place was missing. I ordered a new lens; [but] did not install the new lens; I just removed the aft clip; installed it into the original lens and installed the original lens cover. I signed-off on the write-up that I removed and replaced the lens cover when I didn't. I should have signed that I only replace the clip. It was later written-up by a crew member that it had the incorrect lens cover. ZZZ line maintenance went to another dhc-8-300; aircraft Y and exchanged lens covers with the one on that aircraft.the aft emergency exit has two lens covers; fore and aft. I repaired the right-hand aft cover. The lens cover was pointing 45 degrees down towards the exit. I doubled checked and it was pointing in that position. I checked the (illustrated parts catalog) ipc chapter 33-22-00; figure 25; item 80 and it gives part number 10-XXX and that is what it had in the aircraft. I was working aircraft Y eight days later; went and checked the aft emergency exit lens; the left side was pointing forward with the arrow; not with a 45 degree angle [arrow] pointing down towards the exit. The right side had an arrow pointing down 45 degrees towards the exit; with [same] part number 10-XXX the part I checked out for aircraft X; and what the ipc calls for. The only mistake I made was the write-up sign-off that I [had] removed and replaced (right/right) the lens when I didn't.a crew member wrote that the incorrect lens was in place; three days after the aircraft had routine overnight maintenance (ron). I only replaced the aft clip; checked the position of the arrows; ipc; and installed the original cover. Why the event occurred is that aircraft had the incorrect lens when it came into ron; but all the part numbers were checked.the lens cover was exchanged with another aircraft Y. Now aircraft Y; on the left aft side; has a cover [with an arrow] pointing forward with no 45 degree arrow pointing down and the right-hand aft side has a lens cover [arrow] pointing 45 degrees down towards the exit. Suggest determine if the lens covers [arrows] should point down 45 degrees; or straight forward.

Original NASA ASRS Text

Title: A Mechanic reports he repaired an emergency exit lens cover that had a 45 degree directional arrow on a DHC-8-300 aircraft. He was later told he reinstalled an incorrect lens cover for the aircraft.

Narrative: I was walking thru a DHC-8-300; Aircraft X and noticed that the right-hand aft emergency exit lens cover was not secured on the aft side. I removed the lens and saw that the aft clip that holds it in place was missing. I ordered a new lens; [but] did not install the new lens; I just removed the aft clip; installed it into the original lens and installed the original lens cover. I signed-off on the write-up that I removed and replaced the lens cover when I didn't. I should have signed that I only replace the clip. It was later written-up by a crew member that it had the incorrect lens cover. ZZZ Line Maintenance went to another DHC-8-300; Aircraft Y and exchanged lens covers with the one on that aircraft.The aft emergency exit has two lens covers; fore and aft. I repaired the right-hand aft cover. The lens cover was pointing 45 degrees down towards the exit. I doubled checked and it was pointing in that position. I checked the (Illustrated Parts Catalog) IPC Chapter 33-22-00; Figure 25; Item 80 and it gives Part Number 10-XXX and that is what it had in the aircraft. I was working Aircraft Y eight days later; went and checked the aft emergency exit lens; the left side was pointing forward with the arrow; not with a 45 degree angle [arrow] pointing down towards the exit. The right side had an arrow pointing down 45 degrees towards the exit; with [same] Part Number 10-XXX the part I checked out for aircraft X; and what the IPC calls for. The only mistake I made was the write-up sign-off that I [had] Removed and Replaced (R/R) the lens when I didn't.A crew member wrote that the incorrect lens was in place; three days after the aircraft had routine overnight maintenance (RON). I only replaced the aft clip; checked the position of the arrows; IPC; and installed the original cover. Why the event occurred is that aircraft had the incorrect lens when it came into RON; but all the Part Numbers were checked.The lens cover was exchanged with another Aircraft Y. Now Aircraft Y; on the left aft side; has a cover [with an arrow] pointing forward with no 45 degree arrow pointing down and the right-hand aft side has a lens cover [arrow] pointing 45 degrees down towards the exit. Suggest determine if the lens covers [arrows] should point down 45 degrees; or straight forward.

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.

Attributes
ACN	920067
Time
Date	201011
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Night
Aircraft 1
Make Model Name	Dash 8-300
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Emergency Exit Lighting
Person 1
Function	Technician
Qualification	Maintenance Airframe Maintenance Powerplant
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural FAR Deviation - Procedural Published Material / Policy

A mechanic reports he repaired an emergency exit lens cover that had a 45 degree directional arrow on a dhc-8-300 aircraft. He was later told he reinstalled an incorrect lens cover for the aircraft.