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Am I the only one who thinks the 500-hour mark on a single LRU is nothing special?
Everyone at my hangar makes a big deal when a box hits 500 flight hours without a fault. I just hit that on a Collins Pro Line 21 comm unit, and honestly, it just means we did the basic maintenance right. The real test is how it performs at 1500 hours in a humid Gulf Coast summer. I've seen too many units fail right after their 'milestone' because people get complacent. Are we celebrating reliability or just patting ourselves on the back for following the manual? What's a more meaningful metric we should be tracking instead?
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william_henderson1mo ago
Honestly, you're both missing the bigger picture. Everyone tracks when things break, but nobody talks about the cost of the fixes that keep them running. That 500-hour box probably had a dozen minor squawks that ate up man-hours and parts. We should be adding up all the labor and materials spent per flight hour on each unit. A box that runs 1500 hours but needs constant tweaking is actually worse than one that fails cleanly at 800. Tracking total cost of ownership would show what's truly reliable.
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linda_torres1mo ago
You're right that 500 hours is just a start. In my experience, the real win is tracking mean time between unscheduled removals for the whole fleet, not just one box. A single unit running clean is luck. If ten of the same LRU all average 800 hours before coming off, that says something about the part and our work. That Gulf Coast humidity test is a good point, too. Maybe we should track seasonal failure rates more closely.
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the_linda1mo ago
Totally agree on fleet tracking! We started logging humidity data against failure codes last year and found a clear pattern. It helped us adjust our inspection schedule before the rainy season hit.
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