Airworthiness directives › 2026-16-12
AD 2026-16-12 Airworthiness Directives; Air Tractor, Inc. Airplanes
Models named: AT-802, AT-802A. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Air Tractor, Inc. Model AT-802 and AT-802A airplanes, all serial numbers, certificated in any category, that have Wipaire, Inc. Supplemental Type Certificate (STC) No. SA01795CH installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 7 days after the effective date of September 4, 2024 (effective date of 2024-16-06) or before the airplane accumulates 110 hours time-in-service (TIS) after installation of STC No. SA01795CH, whichever occurs later, and thereafter at intervals not to exceed 110 hours TIS until the airplane is modified as required by paragraph (g)(3) of this AD, inspect the left and right horizontal stabilizer spars for cracks in accordance with Steps 1 through 9 of the Work Instructions-Inspection, Method 1 in Wipaire, Inc. Service Letter 253, Revision D, dated July 3, 2024 (Wipaire SL 253D). (2) If any crack is found in a horizontal stabilizer spar during any inspection required by paragraph (g)(1) of this AD, or if any crack, elongated hole, or corrosion is found in a horizontal stabilizer spar during any inspection required by paragraph (h) of this AD, before further flight, replace the horizontal stabilizer spar. (3) Within 300 hours TIS or 12 months after the effective date of September 4, 2024 (effective date of 2024-16-06), whichever occurs first, install bathtub fittings (Service Kit 1012347-01 or 1012347-02) in accordance with Steps 1 through 10 of the Work Instructions-Install Bathtub Fittings in Wipaire SL 253D except where Step 2 specifies that to be eligible for reinstallation, finlet mount weldments must include the welded gussets shown in figure 8 of Wipaire SL 253D, that constraint is not required by this AD. If any spars were previously modified by installing 7D1-4399 Revision L or earlier, regardless of condition, those spars must be replaced at the same time the bathtub fittings kit is installed.
Unsafe condition
This AD was prompted by additional reports of cracks where the vertical fin structural support brace mounts to the horizontal stabilizer spar. The FAA is issuing this AD to prevent structural failure of the horizontal stabilizer spars. The unsafe condition, if not addressed, could result in structural failure of the horizontal tail with consequent loss of control of the airplane.
Affected ADs
This AD replaces AD 2024-16-06, Amendment 39-22812 (89 FR 67267, August 20, 2024) (AD 2024-16-06).
Read the original on the Federal Register →
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1