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Topic-icon Cherokee Wing Spar Proposed AD: The other shoe drops

  • Jen D
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5 months 5 days ago #1592

Hey Cherokee owners,
We've been expecting this since the wing separation accident in April. The FAA today issued an NPRM for inspection and replacement of the main wing spars in PA-28-140, PA-28-150, PA-28-151, PA-28-160, PA-28-161, PA-28-180, PA-28-181, PA-28-235, PA-28R-180, PA-28R-200, PA-28R-201, PA-28R-201T, PA-28RT-201, PA-28RT-201T, PA-32-260, and PA-32-300.
It states in part: "This proposed AD would require reviewing the airplane maintenance records to determine the number of 100-hour inspections completed on each installed main wing spar and using the number of 100-hour inspections to calculate the factored service hours for each main wing spar. This proposed AD would also require inspecting the lower main wing spar bolt holes for cracks once a main wing spar exceeds the specified factored service hours and replacing any main wing spar when a crack is indicated. This proposed AD would only apply when an airplane has either accumulated 5,000 or more hours time-in-service (TIS); has had either main wing spar replaced with a serviceable main wing spar (more than zero hours TIS); or has missing and/or incomplete maintenance records."

Here's a link to the complete NPRM:
www.federalregister.gov/documents/2018/1...rcraft-inc-airplanes

Last edit: 5 months 5 days ago by Jen D.

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5 months 5 days ago #1593

In addition to sending your comments to the FAA, please also post them here or email them to me. We are accumulating data from Cherokee owners.
Jen

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4 months 4 weeks ago #1610

Just wanted to verify if I understand the factored hours formula correctly -
from the FAA propsed AD:
(N × 100) + [T-(N × 100)]/17 = Factored Service Hours, where N is the number of 100-hour inspections and T is the total hours TIS of the airplane.

Does N include annual ispections as well during the time when the plane was used for flight training or renting?

Thanks,
N417FL

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4 months 4 weeks ago #1611

My understanding is no. N is 100 hour inspections between annuals. So your AP needs to be labeling the inspection correctly.

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4 months 4 weeks ago #1612

The only changes I see might happen to this AD is: the interval after the initial inspections. There may be a followup AD establishing followup inspections and time frames, once they get a feel for whether cracks are a problem for the PA28/32 fleet. I am having the inspection done ASAP now that the standards are established for the Eddy Current inspection. My 1976 Archer II had about 64 - 100 hour inspections before 2010 and 35 since AD 87-08-08 was performed in 1988.

Last edit: 4 months 4 weeks ago by BRYAN RUSSELL.

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4 months 4 weeks ago #1613

Thank you Bryan. I counted 29 100-hours on my PA28-140. I am below 5000 factored hours limits.

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