(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective July 2, 2025.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    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.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 29, Hydraulic Power.

(e) UNSAFE CONDITION

    This AD was prompted  by reports of engine-driven pump hydraulic pres-
    sure hoses  for hydraulic systems number 1 and 2 chafing  against  the
    pylon in the aft equipment bay.  The FAA is issuing this AD to address
    the chafing  of  the  hydraulic systems engine - driven pump hydraulic
    pressure hoses for the hydraulic system against the pylon,  which  may
    lead to hydraulic system leaks  and failures and result in the loss of
    the affected hydraulic system. Loss of both hydraulic systems number 1
    and 2 would substantially  reduce the airplane's  functional capabili-
    ties.

(f) COMPLIANCE

    Comply with this AD within the compliance times specified,  unless al-
    ready done.

(g) INSPECTION OF ENGINE-DRIVEN PUMP HYDRAULIC HOSES

    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.

(h) CORRECTIVE ACTIONS

(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 ser-
    vice information  identified in paragraphs (g)(1) through (3)  of this
    AD.

(2) If any damage (including fouling  or  chafing) is found during the in-
    spection 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.

(i) ADDITIONAL AD PROVISIONS

    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 infor-
    mation 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  accom-
    plished using a method approved by the Manager,  International Valida-
    tion 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.

(j) ADDITIONAL INFORMATION

    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.

(k) MATERIAL INCORPORATED BY REFERENCE

(1) The Director of the Federal Register  approved  the  incorporation  by
    reference of the material  listed in this paragraph under 5 U.S.C. 552
    (a) and 1 CFR part 51.

(2) You must use this material as applicable to do the actions required by
    this AD, unless this AD specifies otherwise.

(i) Bombardier Service Bulletin 700-29-5502, dated November 29, 2023.

(ii) Bombardier Service Bulletin 700-29-6011, dated November 29, 2023.

(iii) Bombardier Service Bulletin 700-29-6502, dated November 29, 2023.

(3) For Bombardier material identified in this AD, contact Bombardier Bus-
    iness  Aircraft  Customer  Response Center,  400 Cote-Vertu Road West,
    Dorval, Quebec H4S 1Y9, Canada;  telephone 514-855-2999; email ac.yul@
    aero.bombardier.com; website bombardier.com.

(4) You may view this material at the FAA, Airworthiness Products Section,
    Operational Safety Branch,  2200 South 216th St.,  Des Moines, WA. For
    information on the availability of this material at the FAA, call 206-
    231-3195.

(5) You may view this material at the National Archives and Records Admin-
    istration (NARA). For information on the availability of this material
    at NARA,  visit www.archives.gov/federal-register/cfr/ibr-locations or
    email fr.inspection@nara.gov.

Issued on April 3, 2025.  Steven W. Thompson, Acting Deputy Director, Com-
pliance & Airworthiness Division, Aircraft Certification Service.

FOR FURTHER INFORMATION CONTACT:  Joseph Catanzaro,  Aviation Safety Engi-
neer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: 516-
228-7300; email: 9-avs-nyaco-cos@faa.gov.