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Old 12-30-2017, 06:57 PM
Ralph Ketter's Avatar
Ralph Ketter Ralph Ketter is offline
Join Date: May 2005
Location: La Luz, NM
Posts: 49
Default Unknown Black Box - What is it?

I'm helping a friend who purchased an RV8 that has no known electrical documentation. The original builder is deceased. I came across this small black box that has 4 wires and surgical tubing attached. It has no markings on the visible surfaces. I have not yet tried to trace the wiring and where the tubing ends up is not apparent.
If you happen to know what is it let me know.
Thanks in advance.

Ralph Ketter
La Luz, NM

RV-6 Flying
Old 12-30-2017, 07:03 PM
Mike S's Avatar
Mike S Mike S is offline
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Location: Dayton Airpark, NV A34
Posts: 16,109

I would hazard a guess that it is manifold pressure.
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

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Old 12-30-2017, 07:03 PM
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Brantel Brantel is offline
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MAP sensor?
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Old 12-30-2017, 07:13 PM
Ralph Ketter's Avatar
Ralph Ketter Ralph Ketter is offline
Join Date: May 2005
Location: La Luz, NM
Posts: 49

It could be a MAP sending unit. It uses a Van's Manifold Pressure gauge but I don't know what the sender looks like. I think this is a good possibility and will try to confirm it.
Ralph Ketter
La Luz, NM

RV-6 Flying
Old 12-30-2017, 08:59 PM
NYTOM NYTOM is offline
Join Date: Jun 2005
Location: Raleigh, North Carolina
Posts: 1,188

I have a switch similar to that in size in my flap control system that prevents deploying them at high speeds. Two wires and a tube tied into my pitot system. Similar but not exactly the same. My MP sensor is much larger than the switch or sensor you show. Tracing that tube should answer your question
Tom Norwood
Classic "Short Tail 6A N822PM
Old 12-31-2017, 05:06 PM
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n82rb n82rb is offline
Join Date: Jan 2007
Location: fort myers fl
Posts: 1,091

that IS a MAP sensor for the vans manifold pressure gauge.

bob burns
RV-4 N82RB
Old 12-31-2017, 06:48 PM
pa38112 pa38112 is offline
Join Date: Mar 2008
Location: Clarksboro, NJ
Posts: 1,004

I have a Vans MAP gauge, and that is not what my sensor looks like. Mine is the analog gauge.
2004 RV6A Flying
2002 RV6A Flying
1978 PA38-112
Old 12-31-2017, 07:33 PM
Bevan Bevan is offline
Join Date: Sep 2007
Location: BC
Posts: 1,718

The answer will be at the end of the tube. I'm thinking manifold pressure.

RV7A Flying since 2015
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Located in western Canada
Old 01-01-2018, 11:59 AM
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jaradtke jaradtke is offline
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Location: Lutz FL
Posts: 160

Airspeed limit switch or MP sensor
Jeff Radtke
Lutz, FL
RV-7A - New Build
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Old 01-06-2018, 07:11 AM
Ralph Ketter's Avatar
Ralph Ketter Ralph Ketter is offline
Join Date: May 2005
Location: La Luz, NM
Posts: 49
Default Unknown Black Box Solved

I finally got back to the airplane yesterday to verify that the unknown black box is indeed a Van's Manifold Pressure Sending Unit P/N IE VMPSND.
It normally comes as part of the analog gauge MAN PRES 35" W/SENDER Part Number = IE VMP35.

Many Thanks to all of you for helping.
Ralph Ketter
La Luz, NM

RV-6 Flying
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