Airworthiness Directive · Amendment 39-23013 · Hydraulic power
Bombardier, Inc., Airplanes
This AD applies to Bombardier, Inc., Model BD-700-1A10 and BD-700-1A11 airplanes, certificated in any category, serial numbers (S/Ns) 60001 through 60076 inclusive, 60083, 60087, and 60089.
The FAA is adopting a new airworthiness directive (AD) for certain Bombardier, Inc., Model BD-700-1A10 and BD-700-1A11 airplanes. This AD was prompted by reports of engine-driven pump hydraulic pressure hoses for hydraulic systems number 1 and 2 chafing against the pylon in the aft equipment bay. This AD requires an inspection of the engine-driven pump pressure hoses for any damage and minimum clearance between the engine-driven pump hydraulic pressure hose and case drain, suction pressure hose, and surrounding pylon structure; and corrective actions if necessary. The FAA is issuing this AD to address the unsafe condition on these products.
Within 500 flight hours or 18 months after the effective date of this AD, whichever occurs first, do a borescope inspection of the routing of hydraulic systems number 1, left-hand side, and number 2, right-hand side, engine-driven pump pressure hoses over the length of the hoses for any damage and for minimum clearance between the engine-driven pump hydraulic pressure hose and case drain, suction pressure hose, and surrounding pylon structure, in accordance with section 2.B. of the Accomplishment Instructions of the applicable service information identified in paragraph (g)(1) through (3) of this AD.
(1) For airplanes identified in Bombardier Service Bulletin 700-29-5502, dated November 29, 2023: Bombardier Service Bulletin 700-29-5502, dated November 29, 2023. Where paragraph 1.A. of Bombardier Service Bulletin 700-29-5502, dated November 29, 2023, identifies “Model BD-700-1A10 aircraft,” this AD requires replacing that text with “Model BD-700-1A11 aircraft.”
(2) For airplanes identified in Bombardier Service Bulletin 700-29-6011, dated November 29, 2023: Bombardier Service Bulletin 700-29-6011, dated November 29, 2023.
(3) For airplanes identified in Bombardier Service Bulletin 700-29-6502, dated November 29, 2023: Bombardier Service Bulletin 700-29-6502, dated November 29, 2023.
(1) If clearance is found to be less than 0.500 inch (12.70 mm) during the inspection required by paragraph (g) of this AD: Before further flight, adjust the applicable hose(s) to obtain minimum clearance between the engine-driven pump hydraulic pressure hose and case drain, suction pressure hose, and surrounding pylon structure, in accordance with section 2.C. of the Accomplishment Instructions of the applicable service information identified in paragraphs (g)(1) through (3) of this AD.
(2) If any damage (including fouling or chafing) is found during the inspection required by paragraph (g) of this AD: Before further flight, replace all damaged pressure hoses, in accordance with section 2.D. of the Accomplishment Instructions of the applicable service information identified in paragraphs (g)(1) through (3) of this AD.
The following provisions also apply to this AD:
(1) Alternative Methods of Compliance (AMOCs): The Manager, International Validation Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or responsible Flight Standards Office, as appropriate. If sending information directly to the manager of the International Validation Branch, send it to the attention of the person identified in paragraph (j) of this AD and email to: AMOC@faa.gov. Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the responsible Flight Standards Office.
(2) Contacting the Manufacturer: For any requirement in this AD to obtain instructions from a manufacturer, the instructions must be accomplished using a method approved by the Manager, International Validation Branch, FAA; or Transport Canada; or Bombardier, Inc.'s Transport Canada Design Approval Organization (DAO). If approved by the DAO, the approval must include the DAO-authorized signature.
For more information about this AD, contact Joseph Catanzaro, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: 516-228-7300; email: 9-avs-nyaco-cos@faa.gov.
