2026-07-07: Air conditioning system

1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. 2. The FAA amends § 39.13 by adding the following new airworthiness directive: 2026-07-07 Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.): Amendment 39-23302; Docket No. FAA-2026-3470; Project Identifier MCAI-2026-00210-T. (a) Effective Date This airworthiness directive (AD) is effective April 17, 2026. (b) Affected ADs None. (c) Applicability This AD applies to all Airbus Canada Limited Partnership (Type Certificate previously held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Model BD-500-1A10 and BD-500-1A11 airplanes, certificated in any category. (d) Subject Air Transport Association (ATA) of America Code 21, Air conditioning system. (e) Unsafe Condition This AD was prompted by the discovery during production flight tests that the outflow valve (OFV) direct current (DC) motor could potentially be inoperative when used in high differential pressure conditions. The FAA is issuing this AD to address loss of OFV control in cabin pressure control system (CPCS) manual (MAN) mode, which if not corrected, could potentially lead to total loss of cabin pressure control, excessive differential pressure across the airplane structure, inability to rapidly depressurize the airplane to ambient, when needed, and inability to evacuate smoke, when needed. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Dispatch Prohibitions (1) As of the effective date of this AD, no person may dispatch an airplane if crew alerting system (CAS) message "AUTO PRESS FAIL (CAUTION)" is displayed. (2) As of the effective date of this AD, no person may dispatch an airplane under the operational procedures of the operator's minimum equipment list (MEL) items corresponding with the following operational procedures of the Master Minimum Equipment List (MMEL) items listed in figure 1 to paragraph (g)(2) of this AD. Note 1 to paragraph (g)(2): There are two operational procedures (O) within MMEL items 21-33-03 and 21-33-04. For this AD, only dispatch under the operational procedures listed in figure 1 to paragraph (g)(2) of this AD is prohibited. Figure 1 to Paragraph (g)(2)-Prohibited MMEL Items 21. Air Conditioning Sequence No. Item Description 33-03 Landing Field Elevation (LFE) Indication (O) May be inoperative provided: (a) Pressurization is operated in manual control mode, (b) Autopilot is operative, (c) Minimum enroute altitude does not exceed 10,000 ft. above MSL, and (d) Operations are restricted to airports at or below 8,000 ft. Landing Field Elevation (LFE). 33-04 Landing Field Elevation (LFE) Automatic Selection (O) May be inoperative provided: (a) Pressurization is conducted in manual mode, (b) Autopilot is operative, and (c) Operations are restricted to airports at or below 8,000 ft. Landing Field Elevation (LFE). (h) Additional AD Provisions The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, AIR-520, Continued Operational Safety 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 Continued Operational Safety Branch, send it to the attention of the person identified in paragraph (i) 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, AIR-520, Continued Operational Safety Branch, FAA; or Transport Canada; or Airbus Canada Limited Partnership's Transport Canada Design Approval Organization (DAO). If approved by the DAO, the approval must include the DAO-authorized signature. (i) Additional Information For more information about this AD, contact Joshua Baek, Aviation Safety Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone: 562-627-6725; email: joshua.y.baek@faa.gov. (j) Material Incorporated by Reference None. Issued on March 31, 2026. Victor Wicklund, Acting Director, Integrated Certificate Management Division, Aircraft Certification Service. [FR Doc. 2026-06465 Filed 3-31-26; 4:15 pm]BILLING CODE 4910-13-P