Noah Cohen Posted July 11, 2021 Report Posted July 11, 2021 I am needing a landing light switch for a 1970 M20F executive 21. Can anyone tell me where to buy it and what the part number would be? Quote
carusoam Posted July 11, 2021 Report Posted July 11, 2021 2 hours ago, Noah Cohen said: I am needing a landing light switch for a 1970 M20F executive 21. Can anyone tell me where to buy it and what the part number would be? Welcome aboard Noah! The landing light switch is a combination CB/switch… The circuit breaker is a mechanical device that wears a little bit each time it gets used… There should be a strong over-center click when you turn the switch on… As it wears, the click goes away… until it won’t stay on. A replacement can easily be purchased from Aircraft Spruce. Selecting the new one is two parts…Amps and switch body. It is a generally expensive device to purchase… getting it installed is another WHat the…. kind of moment… If you have the access panels in front of the windshield still… you are in luck… If you really need help getting the right one… find Dan at Lasar… he is really good with Mooney parts… Another thing that happens often… the panel vibration absorbers wear or become loose… the panel says and hits the landing light switch and turns it off… So… See if you need acorn nuts to hold the rubber dampers in place…. Or need new rubber dampers… AS has all of that stuff… PP thoughts only, not a mechanic… Best regards, -a- Quote
Yetti Posted July 11, 2021 Report Posted July 11, 2021 Parts manual will have that. Someone will post you a copy Quote
Noah Cohen Posted July 11, 2021 Author Report Posted July 11, 2021 Could someone post a copy of the parts manual? I have a parts manual but it doesn't cover the electrical componants Quote
carusoam Posted July 11, 2021 Report Posted July 11, 2021 Now where did the uploads all go? The land of the parts manuals and POHs… and service manuals… Its around here somewhere… -a- Quote
Hank Posted July 11, 2021 Report Posted July 11, 2021 23 minutes ago, carusoam said: Now where did the uploads all go? The land of the parts manuals and POHs… and service manuals… Its around here somewhere… -a- We upload documents into the "Download" section, available at the top of the home page. 1 Quote
carusoam Posted July 11, 2021 Report Posted July 11, 2021 https://mooneyspace.com/files/ See if this helps get Noah any closer… -a- 1 Quote
Guest Posted July 11, 2021 Report Posted July 11, 2021 Strangely, it’s not in the IPC, it’s in the maintenance manual. Quote
bradp Posted July 12, 2021 Report Posted July 12, 2021 If you have an LED landing light there is a case for reducing the Amperage of the CB/ switch to better match the circuit draw. You’d just need to be aware of that should you go back to incandescent. Quote
neilpilot Posted July 12, 2021 Report Posted July 12, 2021 2 minutes ago, bradp said: If you have an LED landing light there is a case for reducing the Amperage of the CB/ switch to better match the circuit draw. You’d just need to be aware of that should you go back to incandescent. I believe owners will swap a LED landing light for the OEM incandescent without significant documentation other than a simple log entry. Maybe this is done by the owner without an A&P signoff. However, even though I understand why a reduced CB amperage makes sense, this change would require A&P endorsement. Maybe even a 337 as an alteration? Quote
WaynePierce Posted July 12, 2021 Report Posted July 12, 2021 The landing light CB in my J caused a "that can't possibly be right" moment when mine went bad. Good luck with your F. Quote
bradp Posted July 12, 2021 Report Posted July 12, 2021 14 minutes ago, neilpilot said: I believe owners will swap a LED landing light for the OEM incandescent without significant documentation other than a simple log entry. Maybe this is done by the owner without an A&P signoff. However, even though I understand why a reduced CB amperage makes sense, this change would require A&P endorsement. Maybe even a 337 as an alteration? Most AP would likely consider this to be a minor mod. I’ll insert the carousam disclaimer here 2 Quote
EricJ Posted July 12, 2021 Report Posted July 12, 2021 7 hours ago, neilpilot said: I believe owners will swap a LED landing light for the OEM incandescent without significant documentation other than a simple log entry. Maybe this is done by the owner without an A&P signoff. However, even though I understand why a reduced CB amperage makes sense, this change would require A&P endorsement. Maybe even a 337 as an alteration? I'll +1 that it'd likely be a minor alteration. That said, breakers are primarily to protect the wiring rather than a load fault, so if the wiring was downgraded to smaller gauge due to the smaller current load, then a smaller breaker would be necessary. If the wiring remains the same, there's not much need to shrink the breaker. That said, placing a smaller breaker that still supports the load wouldn't hurt anything, either, it'd just trip earlier than necessary. 2 1 Quote
MikeOH Posted July 13, 2021 Report Posted July 13, 2021 Ditto to EricJ's comment. It is a common misconception that CBs are there to protect the load; not true. They are sized to keep the wires from being damaged in the case of a short/too high current draw downstream of the CB. Absolutely no reason to downsize the CB just because you put in an LED low-draw light. 3 Quote
bradp Posted July 13, 2021 Report Posted July 13, 2021 I’ve always considered a circuit breaker function to protect both the wire and the internal circuitry of the electrical device connected to that wire. Ie reverse polarity protection for a radio, in some circumstances can be accomplished through a breaker. So can protection for a short internal to the device. I’ve heard for years that CB protects the wire - and that’s true. Educate me further please. Quote
atpdave Posted July 13, 2021 Report Posted July 13, 2021 Pages from AC_43.13-1B_w-chg1 Aircraft Inspection and Repair.pdf 1 1 Quote
carusoam Posted July 14, 2021 Report Posted July 14, 2021 Wow! Great work Dave! Tech References while you read… with highlights! Go MS! Best regards, -a- Quote
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