Airworthiness Directive · Amendment 39-11979 · Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-120 Series Airplanes
Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-120 Series Airplanes
Model EMB-120 series airplanes, certificated in any category, having serial numbers listed in EMBRAER Service Bulletin 120-29-0047, Change 01, dated October 22, 1996.
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), applicable to certain EMBRAER Model EMB-120 series airplanes, that requires a one-time inspection to detect wear of the hydraulic pump hoses, and corrective action, if necessary. This AD also requires relocation of the clip that secures the left forward hold-open rod of both nacelles. The actions specified by this AD are intended to prevent chafing and consequent rupture of the hydraulic line and loss of hydraulic pressure, which could result in reduced controllability of the airplane. This action is intended to address the identified unsafe condition.
To prevent rupture of the hydraulic line and loss of hydraulic pressure due to chafing, which could result in reduced controllability of the airplane, accomplish the following:
(a) Within 75 flight hours after the effective date of this AD, perform a general visual inspection to detect discrepancies (wear, chafing, or scores) of all hydraulic pump hoses installed in both nacelles, in accordance with Part I of EMBRAER Service Bulletin 120-29-0047, Change 01, dated October 22, 1996. Prior to further flight, perform all applicable corrective actions in accordance with the service bulletin.
Note 2: Accomplishment, prior to the effective date of this AD, of the inspection in accordance with Part I of EMBRAER Service Bulletin 120-29-0047, dated August 22, 1996, is acceptable for compliance with the requirements of paragraph (a) of this AD.
Note 3: For the purposes of this AD, a general visual inspection is defined as: “A visual examination of an interior or exterior area, installation, or assembly to detect obvious damage, failure, or irregularity. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight, or drop-light, and may require removal or opening of access panels or doors. Stands, ladders, or platforms may be required to gain proximity to the area being checked.”
(b) Within 75 flight hours after the effective date of this AD, relocate the clip that secures the left forward hold-open rod of both nacelles in accordance with Part II of EMBRAER Service Bulletin 120-29-0047, Change 01, dated October 22, 1996.
