Airworthiness Directive · Amendment 39-18901 · Stabilizers
The Boeing Company Airplanes
This AD applies to all The Boeing Company Model MD-90-30 airplanes, certificated in any category.
We are adopting a new airworthiness directive (AD) for all The Boeing Company Model MD-90-30 airplanes. This AD was prompted by a report of cracking in a horizontal stabilizer rear spar cap. This AD requires repetitive inspections for any crack in the left and right side horizontal stabilizer rear spar upper caps, and repair or replacement if necessary. We are issuing this AD to address the unsafe condition on these products.
Except as required by paragraph (i) of this AD, at the applicable times specified in table 1 or table 2 of paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin MD90-55A018, dated June 29, 2016: Do either an open hole eddy current high frequency (ETHF) or a surface eddy current low frequency (ETLF) inspection for any crack in the left and right side horizontal stabilizer rear spar upper caps common to the elevator hinge fitting at station XE = ± 5.931, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin MD90-55A018, dated June 29, 2016. Repeat the inspection thereafter at the time specified in tables 1 through 4, as applicable, of paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin MD90-55A018, dated June 29, 2016.
If any crack is found during any inspection required by paragraph (g) of this AD, repair or replace before further flight in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin MD90-55A018, dated June 29, 2016.
Where Boeing Alert Service Bulletin MD90-55A018, dated June 29, 2016, specifies a compliance time “after the original issue date of this service bulletin,” this AD requires compliance within the specified compliance time after the effective date of this AD.
