Instrument panel lighting Cessna Cutlass 172RG

[Nathan N]

I hope you all had a lovely thanksgiving.

I’m trying to find out how I can replace specific instrument panel lights (see attached). Regrettably a few of them aren’t functioning in my Cutlass. I’m assuming it’s because the bulbs are dead…

That’s not a photograph of my plane. The lighting which I pointed out looks identical to my RG however.

They are these little pop-out lights... I apologize for the vague description, I’m unsure what to call them

If you can shed some light *zing* on this I’d be indebted.

Thanks,
Nathan

 

[Stan Cooper]

Those are post lights, Nathan.

https://www.aircraftspruce.com/search/search.php?s=post+lights&x=34&y=15

 

[Nathan N]

Those are post lights, Nathan.

https://www.aircraftspruce.com/search/search.php?s=post+lights&x=34&y=15

Thank you Stan.

Thank you Stan.

Can I just replace the bulbs?

I don’t want have to take out a second mortgage.

 

[murphey]

if they are ge53, the little bulbs cost between 50 cents and a dollar depending where you get them.

 

[Nathan N]

I’ll remove one and will check tomorrow.

Thanks!

 

[Stan Cooper]

The post light bulbs for the 1980-1985 172RG are MS25237-327 (GE 327) according to the Cessna Model 172RG Series maintenance manual. $0.95 each from AS&S.

https://www.aircraftspruce.com/catalog/elpages/gereplacement_11-04015.php?clickkey=4938277

 

[Nathan N]

The post light bulbs for the 1980-1985 172RG are MS25237-327 (GE 327) according to the Cessna Model 172RG Series maintenance manual. $0.95 each from AS&S.

https://www.aircraftspruce.com/catalog/elpages/gereplacement_11-04015.php?clickkey=4938277

Thanks a lot!

 

[Nathan N]

Is there an LED version available?

I couldn't find anything online...

 

[Mtns2Skies]

Is there an LED version available?

I couldn't find anything online...

https://www.soslightbulbs.com/produ.../lamp-53-led-equivalent-miniature-light-bulb/

 

[Dan Thomas]

Just pull the little light hood off. The bulb is in there. Easy to replace.

The #53 LED bulb is much bigger. The 327 28-volt (or 330 12-volt) is the right bulb.

LEDs won't dim properly either.

 

[Stan Cooper]

Just pull the little light hood off. The bulb is in there. Easy to replace.

The #53 LED bulb is much bigger. The 327 28-volt (or 330 12-volt) is the right bulb.

LEDs won't dim properly either.

This.

Dimming is the issue with LED replacements. LED dimmers typically use pulse width modulation which changes the duty cycle of the pulse on-off ratio and is a very different animal than the OEM dimming circuit for incandescent bulbs. Additionally, the pulses are square waves which are rich in harmonics all the way up to VHF frequencies and can cause RFI.

 

[dmspilot]

I’m assuming it’s because the bulbs are dead…

Might not be a correct assumption. Pressing or wiggling them sometimes makes them work.

 

[Nathan N]

You are all incredible.

Thanks so much for the knowledge.

I’m going to add you all to my will.


Thanks again,
Nathan

 

[landon18]

I’ll remove one and will check tomorrow.

Thanks!

Hey Nathan how did you remove them?

 

[455 Bravo Uniform]

They typically just pull off and push on.

 

[write-stuff]

Moving on to ring lights might be an option.

 

[CJude81]

The post light bulbs for the 1980-1985 172RG are MS25237-327 (GE 327) according to the Cessna Model 172RG Series maintenance manual. $0.95 each from AS&S.

https://www.aircraftspruce.com/catalog/elpages/gereplacement_11-04015.php?clickkey=4938277

Or auto zone or Walmart… and you don’t pay shipping

 

[camorton]

The previous owner installed a MaxDim dimmer control in my plane. That allowed him to replace all of the post light bulbs with LED versions. The MaxDim is kind of pricey, but it works real nice. And no more burned out bulbs.

C.