17
$\begingroup$

Let's say you discover that your landing light is inoperable during the preflight. Your aircraft doesn't have a MEL, so you follow 14 CFR §91.213(d). Assuming you do everything else required (placard, etc.), would placing a collar around a circuit breaker be considered deactivation?

If not, is there anything that a private pilot can do that would be considered deactivation?

$\endgroup$
  • 2
    $\begingroup$ The humorous absurdity of pulling & collaring a breaker (interrupting the circuit) for a failed landing light (usually because the incandescent filament has burned out, interrupting the circuit) is not lost on me. Though on a serious note, if we're talking about a fault in a HID landing light system or LED landing light the potential failure modes certainly warrant "preventing the operation" of the system until you know what caused the fault... $\endgroup$ – voretaq7 Dec 28 '13 at 8:36
  • 2
    $\begingroup$ It does seem a bit absurd. I asked this question because it's one that seems to come up in checkrides. During my checkride I was asked what I would do in this situation. I answered that I would collar the circuit breaker, and the DE told me that would not be enough and I would have to have a certified mechanic repair the light or disconnect the power to the circuit breaker to be legal. I didn't argue, but I'm pretty sure he's wrong and the collaring is deactivation. $\endgroup$ – kevin42 Dec 28 '13 at 15:33
  • 1
    $\begingroup$ I would think collaring qualifies as deactivation too - certainly as lnafziger pointed out it's what manufacturers recommend, and I'm pretty sure it's what airlines do for non-critical equipment that needs to be "tagged out" because it's broken. For that matter taping a bent index card cover over the switch so you can't turn it on it would also seem to qualify, albeit a somewhat inelegant solution. $\endgroup$ – voretaq7 Dec 28 '13 at 21:55
14
$\begingroup$

Based on this Advisory Circular, the answer is yes.

g. Deactivation means to make a piece of equipment or an instrument unusable to the pilot/crew by preventing its operation

Collaring the circuit breaker prevents it from being pushed in, and therefore prevents its operation.

$\endgroup$
  • 5
    $\begingroup$ This is consistent with MEL M&O procedures that in some cases specify doing exactly this. $\endgroup$ – Lnafziger Dec 18 '13 at 21:24

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.