Airworthiness Directive · Amendment 39-11879 · Boeing Model 767-200, -300, and -300F Series Airplanes
Boeing Model 767-200, -300, and -300F Series Airplanes
Superseded. A later AD replaced this one: AD 2013-25-03. Comply with the one in force.
Model 767-200, -300, and -300F series airplanes, with Line Numbers 1 through 800 inclusive; certificated in any category.
Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (c) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
This amendment adopts a new airworthiness directive (AD) that is applicable to certain Boeing Model 767-200, -300, and -300F series airplanes. This action requires a functional check of the shear rivets in all six elevator power control actuator (PCA) bellcrank assemblies to determine the condition of the shear rivets, and replacement or rework of the bellcrank assemblies, if necessary. This action is necessary to detect and correct any failed or partially yielded shear rivets of the elevator PCA bellcrank assemblies. Failure of two bellcrank assemblies on one side can result in that single elevator surface moving to a hardover position independent of pilot command resulting in a significant pitch upset recoverable by the crew. Failure of three bellcrank assemblies on one side may result in loss of controllability of the airplane. This action is intended to address the identified unsafe condition.
To detect and correct any failed or partially yielded shear rivets of the elevator power control actuator (PCA) bellcrank assembly, which could result in (1) failure of two bellcrank assemblies on one side of the airplane and consequent movement of the single elevator to a hardover position independent of pilot command, resulting in a significant pitch upset recoverable by the crew; or (2) failure of three bellcrank assemblies on one side and consequent loss of controllability of the airplane; accomplish the following:
(a) Within 30 days after the effective date of this AD, perform a functional check of one shear rivet in all six elevator PCA bellcrank assemblies to determine the condition of the shear rivets; in accordance with Paragraph 3, Accomplishment Instructions, of Boeing Alert Service Bulletin 767-27A0166, dated August 17, 2000.
(1) If all penetration depths when measured per Figure 2 of the alert service bulletin are 0.50 inch or more, no further action is required by this AD.
(2) If any penetration depth when measured per Figure 2 of the alert service bulletin is 0.35 inch or more, but less than 0.50 inch, rework or replace the bellcrank assembly with a new or serviceable bellcrank assembly within 400 flight hours after accomplishing the functional check. After installation of a new or serviceable bellcrank assembly, prior to further flight, repeat the functional check of all the bellcrank assemblies to make sure the rivets are still in good condition (as specified in the alert service bulletin) after installation, in accordance with Figure 2 of the alert service bulletin.
(3) If any penetration depth when measured per Figure 2 of the alert service bulletin is less than 0.35 inch, prior to further flight, rework or replace the bellcrank assembly with a new or serviceable bellcrank assembly. After installation of a new or serviceable bellcrank assembly, and prior to further flight, repeat the functional check of all the bellcrank assemblies to make sure the rivets are still in good (as specified in the alert service bulletin) condition after installation, in accordance with Figure 2 of the alert service bulletin.
(b) If one or more bellcrank shear rivets have a measured penetration depth of less than 0.50 inch, within 10 days after performing the initial functional check required by paragraph (a) of this AD: Submit a copy of the completed PCA Elevator Bellcrank Shear Rivet Inspection Report, as provided in Boeing Alert Service Bulletin 767-27A0166, dated August 17, 2000, to the following address: Manager, Seattle Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington 98055-4056; fax (425) 227-1181.
