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MS25041 Press-To-Test Indicator

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Overview

Miniature press-to-test indicator with built-in bulb testing device. Adjustable dimmer. Uses #330 (12V) or #327 (24V) bulb. Bulbs NOT included, order separately.

Part numbers for replacement bulbs are 11-04016 (GE-330) and 11-04015 (GE-327). See "Accessories" tab to purchase.

Reference Chart

Description
Part No.
Press-To-Test MS25041-1 Clear
11-04226
Press-To-Test MS25041-3 Green
11-03911
Press-To-Test MS25041-10 Blue
11-04227
Press-To-Test MS25041-2 Red
11-03910
Press-To-Test MS25041-4 Amber
11-03912

Documents

  • Accessories
  • Frequently Purchased With
  • Customers Also Viewed

Reviews

great

Dan B Verified Purchase

PRESS-TO-TEST MS25041-2 RED

September 17, 2022

Expensive but worth the look and functionality.

Philip A Verified Purchase

PRESS-TO-TEST MS25041-2 RED

February 18, 2022

perfect.

Kim G Verified Purchase

PRESS-TO-TEST MS25041-4 AMBER

June 24, 2021

Unchanged in 50 years. Did the job for the Navy then, works good in the Bo now.

Thomas W
February 22, 2021

perfect

John E
August 24, 2020

They are very well done and They work.

Mauricio F
June 13, 2020

Used this as my ads-b ‘fail’ light. Worked out great

Brian
April 30, 2020

Merry
April 18, 2019

Fast shipping, easy order placement, thanks!

Debra
March 23, 2017

Good reliable light. Been used for more than 40 years. But for $65 (tax &shipping), you think they could have included a bulb and a decent wiring diagram. The drawing Spruce provides is a help but not much..

Chris P Verified Purchase

PRESS-TO-TEST MS25041-4 AMBER

December 18, 2021

Q&A

Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: It says miniature but does not mention a size. What is mounting hole size and diameter of light?

The mounting hole should be approx 15/32", and the lens is .650".

Q: What are the part numbers for the bulbs?

Part numbers for replacement bulbs are 11-04016 (GE-330) and 11-04015 (GE-327). See "Accessories" tab to purchase.

Q: There are 3 prongs on the back of Press to test indicator. Which tab is used for which?

There are three prongs labeled labled 1, 2 and 3. When hooked up, 1 is ground, 1 & 3 is on and 1 & 2 is off.

Q: Which 2 prongs on the MS25041 indicators are used for push to test function? 1&2 or 1&3?

We have added a drawing to the 'Documents' tab of this web page. Please review the details by downloading the PDF.

Q: Can the MS25041 press-to-test indicator lights be used in certified aircraft?

Yes, these are MIL spec units and can be used in certified aircraft per the manufacturer.

Q: What is the electrical consumption MS25041-10?

If the aircraft is 14v you would use the ge-330(14V .08A) or if 28v (28V .04A.) It would depend on your voltage.

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