Aft Wing tip Position Lighte white 24V Sys

[Cabanaboy]

Both Aft position lights are out, I can not find the NAV light fuse. Green and Red are burning. I assume they are on same power source and rocker switch. See photo, light bulb looks okay as far as i can tell. Any idea? Is it just the bulbs or somewhere else? Any suggestions or thoughts would be appreciated.

[Cabanaboy]

photo

[Cabanaboy]

What kind of caulk is on the Glass Lens, Was white on my lens I think that holds the glass securely. Any ideas? Also had some black caulk under Alum. peice, I assume to keep water out? anyone change these?

[kortopates]

My K model IPC calls out RTV102 which is a silicone rubber ahesive sealant. These days there are better non-corrosive silicone sealants for electrical apps such as RTV3145 available from Spruce http://www.aircraftspruce.com/catalog/cmpages/dowCorningRTV3145.php but pricey and probably overkill for this. The 28V K model uses H35W28V bulb (Halogen 35 watt 28volt) and TP39 socket but your IPC will show the correct Whelen part #'s. Be careful, although the bulbs are available from Whelen, the TP39 sockets the leads fit into are not and are real hard to find. However, its sounds like your issue is more likely wiring if there is no voltage at the sockets.

[Cabanaboy]

Quote: kortopates

My K model IPC calls out RTV102 which is a silicone rubber ahesive sealant. These days there are better non-corrosive silicone sealants for electrical apps such as RTV3145 available from Spruce http://www.aircraftspruce.com/catalog/cmpages/dowCorningRTV3145.php but pricey and probably overkill for this. The 28V K model uses H35W28V bulb (Halogen 35 watt 28volt) and TP39 socket but your IPC will show the correct Whelen part #'s. Be careful, although the bulbs are available from Whelen, the TP39 sockets the leads fit into are not and are real hard to find. However, its sounds like your issue is more likely wiring if there is no voltage at the sockets.

[kortopates]

Interesting your manual calls for Caulk, mine just specifies the RTV (in IPC) which is what was there previously and what I used to mount the lens to the aluminium wing tip and cover. But I kept it off the socket and wires so as not to glue them to the cover.

[Cabanaboy]

Mine says use RTV (I thought on lens base) in IPC,  and caulk as well inside "cover" to stop water i thought, see legend photo. I have some black tacky goop on the lens cover and airframe, see other photo. thanks King

[kortopates]

I looked again and my IPC does not list the 3M Caulk. Yours is 6 yrs younger so perhaps something they added. Don't think you go wrong with some ordinary caulk.

[Piloto]

On filament type light bulbs the best way to verify they are good is using an ohmeter to measure resistance (less than 10 ohms) or applying the rated voltage directly to them. I would check and clean all the wire connectors to the lights. Contact oxidation is a common cause that interrupts current flow.

 

José

[Cabanaboy]

Quote: Piloto

On filament type light bulbs the best way to verify they are good is using an ohmeter to measure resistance (less than 10 ohms) or applying the rated voltage directly to them. I would check and clean all the wire connectors to the lights. Contact oxidation is a common cause that interrupts current flow.

 

José

[Cabanaboy]

photo of black caulk:

[Cabanaboy]

Have found caulk solution, 3M Strip Caulk 08578.

Soft non-hardening caulking material in one foot lengths for use in all types of seams, joints and openings. This product is easily thumbed into place and smoothed with a finger.

 

Link:

http://3mcollision.com/3m-strip-calk-08578-black.html