Airworthiness Directive · Amendment 39-11916 · Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-120 Series Airplanes
Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-120 Series Airplanes
Superseded. A later AD replaced this one: AD 2004-01-04. Comply with the one in force.
Model EMB-120 series airplanes as listed in EMBRAER Service Bulletin 120-32-0077, Change 02, dated December 23, 1997; 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 (d) 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), applicable to certain EMBRAER Model EMB-120 series airplanes, that requires revising the Airplane Flight Manual (AFM), and either installing hydraulic tube assemblies incorporating a check valve, or visually inspecting the check valve if already installed and corrective action, if necessary. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent the landing gear doors from becoming blocked from opening during application of emergency procedures in the event of a loss of hydraulics.
To prevent the landing gear doors from becoming blocked from opening during application of emergency procedures in the event of a loss of hydraulics, accomplish the following:
(a) Within 10 flight hours after the effective date of this AD, revise the “Emergency Procedures” and “Abnormal Procedures” sections of the FAA-approved AFM by inserting into the AFM a copy of EMB-120 AFM 120/794, Revision 45, dated October 14, 1996.
(b) For airplanes on which the check valve has been installed in accordance with EMBRAER Service Bulletin 120-32-0077, dated February 7, 1997: Within 100 hours after the effective date of this AD, conduct a visual inspection to detect the check valve flow direction in accordance with Service Bulletin 120-32-0077, Change 02, dated December 23, 1997. If the check valve is installed incorrectly, prior to further flight, reinstall the check valve in the proper position in accordance with Change 02 of the service bulletin.
(c) For airplanes on which the check valve has not been installed in accordance with EMBRAER Service Bulletin 120-32-0077, dated February 7, 1997; or Change 01, dated September 25, 1997; or Change 02, dated December 23, 1997: Within 2,000 flight hours after the effective date of this AD, install hydraulic tube assemblies incorporating a check valve in accordance with Service Bulletin 120-32-0077, Change 02, dated December 23, 1997.
Note 2: Accomplishment of the installation in accordance with EMBRAER Service Bulletin 120-32-0077, Change 01, dated September 25, 1997, prior to the effective date of this AD, is acceptable for compliance with this paragraph.
