[Federal Register Volume 88, Number 70 (Wednesday, April 12, 2023)]
[Rules and Regulations]
[Pages 21900-21902]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2023-07588]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2022-0679; Project Identifier MCAI-2021-01213-T; 
Amendment 39-22392; AD 2023-06-06]
RIN 2120-AA64


Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate 
Previously Held by Bombardier, Inc.) Airplanes; Correction

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule; correction.

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SUMMARY: The FAA is correcting an airworthiness directive (AD) that was 
published in the Federal Register. That AD applies to all MHI RJ 
Aviation ULC Model CL-600-2C10 (Regional Jet Series 700, 701 & 702) 
airplanes, Model CL-600-2C11 (Regional Jet Series 550) airplanes, Model 
CL-600-2D15 (Regional Jet Series 705) airplanes, Model CL-600-2D24 
(Regional Jet Series 900) airplanes, and Model C-600-2E25 (Regional Jet 
Series 1000) airplanes. As published, a portion of the initial 
compliance time for doing the new ram-air valve task specified in the 
regulatory text for certain airplanes is incorrect. This document 
corrects that error. In all other respects, the original document 
remains the same.

DATES: This correction is effective April 28, 2023. The effective date 
of AD 2023-06-06 remains April 28, 2023.

ADDRESSES: 
    AD Docket: You may examine the AD docket at regulations.gov under 
Docket No. FAA-2022-0679; or in person at Docket Operations between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD 
docket contains this final rule; correction, the mandatory continuing 
airworthiness information (MCAI), any comments received, and other 
information. The address for Docket Operations is U.S. Department of 
Transportation, Docket Operations, M-30, West Building Ground Floor, 
Room W12-140, 1200 New Jersey Avenue SE, Washington, DC 20590.

FOR FURTHER INFORMATION CONTACT: Chirayu A. Gupta, Aerospace Engineer, 
Airframe and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart 
Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7300; email [email protected].

SUPPLEMENTARY INFORMATION:

Background

    AD 2023-06-06, Amendment 39-22392 (88 FR 17682, March 24, 2023) (AD 
2023-06-06), requires revising the existing maintenance or inspection 
program, as applicable, to incorporate two aircraft maintenance manual 
(AMM) tasks. That AD applies to all MHI RJ Aviation ULC Model CL-600-
2C10 (Regional Jet Series 700, 701 & 702) airplanes, Model CL-600-2C11 
(Regional Jet Series 550) airplanes, Model CL-600-2D15 (Regional Jet 
Series 705) airplanes, Model CL-600-2D24 (Regional Jet Series 900) 
airplanes, and Model CL-600-2E25 (Regional Jet Series 1000) airplanes.

Need for the Correction

    As published, a portion of the initial compliance time specified in 
paragraph (g)(1)(ii) of AD 2023-06-06 is incorrect. The initial 
compliance time specified in paragraph (g)(1)(ii) of AD 2023-06-06 is 
within 90 days after the effective date of this AD or before 
accumulating 3,000 total flight hours, ``whichever occurs later.'' That 
compliance time should be within 90 days after the effective date of 
this AD or before accumulating 3,000 total flight hours, ``whichever 
occurs first.'' This is the compliance time provided in Transport 
Canada AD CF-2021-38R1, dated May 25, 2022, which the FAA intended to 
match.

Correction of Publication

    This document corrects an error and correctly adds the AD as an 
amendment to 14 CFR 39.13. Although no other part of the preamble or 
regulatory information has been corrected, the FAA is publishing the 
entire rule in the Federal Register.
    The effective date of this AD remains April 28, 2023.
    Since this action only corrects a certain compliance time, it has 
no adverse economic impact and imposes no additional unforeseen burden 
on any person. Therefore, the FAA has determined that notice and public 
procedures are unnecessary.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

Adoption of the Amendment

0
Accordingly, pursuant to the authority delegated to me by the 
Administrator,

[[Page 21901]]

the FAA amends part 39 of the Federal Aviation Regulations (14 CFR part 
39) as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
1. The authority citation for part 39 continues to read as follows:

    Authority: 49 U.S.C. 106(g), 40113, 44701.


Sec.  39.13  [Corrected]

0
2. The FAA amends Sec.  39.13 by adding the following new airworthiness 
directive:

2023-06-06 MHI RJ Aviation ULC (Type Certificate Previously Held by 
Bombardier, Inc.): Amendment 39-22392; Docket No. FAA-2022-0679; 
Project Identifier MCAI-2021-01213-T.

(a) Effective Date

    This airworthiness directive (AD) is effective April 28, 2023.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to all MHI RJ Aviation ULC airplanes, 
certificated in any category, identified in paragraphs (c)(1) 
through (5) of this AD.
    (1) Model CL-600-2C10 (Regional Jet Series 700, 701 & 702) 
airplanes.
    (2) Model CL-600-2C11 (Regional Jet Series 550) airplanes.
    (3) Model CL-600-2D15 (Regional Jet Series 705) airplanes.
    (4) Model CL-600-2D24 (Regional Jet Series 900) airplanes.
    (5) Model CL-600-2E25 (Regional Jet Series 1000) airplanes.

(d) Subject

    Air Transport Association (ATA) of America Code: 21, Air 
conditioning.

(e) Reason

    This AD was prompted by a determination that the existing 
maintenance or inspection program, as applicable, must be revised to 
incorporate two aircraft maintenance manual (AMM) tasks. The FAA is 
issuing this AD to address in-service reports of emergency ram air 
valve part number (P/N) GG670-95019-1 stuck in closed or partially 
open positions, which, if not corrected could result in a complete 
loss of outside air supply, leading to an increase in flight deck 
and cabin temperatures and a possible increased level of 
contaminated air (carbon monoxide, carbon dioxide, or ozone).

(f) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

(g) Maintenance or Inspection Program Revision

    (1) Within 90 days after the effective date of this AD, revise 
the existing maintenance or inspection program, as applicable, to 
incorporate the information specified in figure 1 to the 
introductory text of paragraph (g)(1) of this AD. The initial 
compliance time for doing the task is at the applicable time 
specified in paragraph (g)(1)(i) or (ii) of this AD.

Figure 1 to the Introductory Text of Paragraph (g)(1)--AMM Task for the 
Ram-Air Valve

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[GRAPHIC] [TIFF OMITTED] TR12AP23.024

    (i) For airplanes that have accumulated less than 1,800 flight 
hours since the last operational check of the ram air shutoff valve 
was performed as specified in AMM Task 21-52-04-710-801-A01, and for 
airplanes that have accumulated less than 1,800 flight hours from 
the date of issuance of the original airworthiness certificate or 
original export certificate of airworthiness: Within 90 days after 
the effective date of this AD, or before accumulating 1,800 total 
flight hours, whichever occurs later.
    (ii) For airplanes that have accumulated 1,800 flight hours or 
more since the last operational check of the ram air shutoff valve 
was performed as specified in AMM Task 21-52-04-710-801-A01, and for 
airplanes that have accumulated 1,800 flight hours or more since the 
date of issuance of the original airworthiness certificate or 
original export certificate of airworthiness and for which no 
operational check of the valve has been performed: Within 90 days 
after the effective date of this AD or before accumulating 3,000 
total flight hours, whichever occurs first.
    (2) Within 90 days after the effective date of this AD, revise 
the existing maintenance or inspection program, as applicable, to 
incorporate the information specified in figure 2 to the 
introductory text of paragraph (g)(2) of this AD. The initial 
compliance time for doing the task is at the applicable time 
specified in paragraph (g)(2)(i) or (ii) of this AD.

[[Page 21902]]

Figure 2 to the Introductory Text of Paragraph (g)(2)--AMM Task for the 
Pack Discharge and Ram-Air Supply Ducts
[GRAPHIC] [TIFF OMITTED] TR12AP23.025

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    (i) For airplanes that have accumulated less than 17,600 flight 
hours since the last detailed inspection of the pack discharge and 
ram air supply ducts was performed as specified in AMM Task 21-51-
00-220-801-A01, and for airplanes that have accumulated less than 
17,600 flight hours since the date of issuance of the original 
airworthiness certificate or original export certificate of 
airworthiness: Within 90 days after the effective date of this AD, 
or before accumulating 17,600 total flight hours, whichever occurs 
later.
    (ii) For airplanes that have accumulated 17,600 flight hours or 
more since the last detailed inspection of the pack discharge and 
ram air supply ducts as specified in AMM Task 21-51-00-220-801-A01, 
and for airplanes that have accumulated 17,600 flight hours or more 
since the date of issuance of the original airworthiness certificate 
or original export certificate of airworthiness, and for which no 
detailed inspection of the pack discharge and ram air supply ducts 
has been performed: Within 90 days after the effective date of this 
AD.

(h) No Alternative Actions or Intervals

    After the existing maintenance or inspection program has been 
revised as required by paragraph (g) of this AD, no alternative 
actions (e.g., inspections) or intervals may be used unless the 
actions and intervals are approved as an alternative method of 
compliance (AMOC) in accordance with the procedures specified in 
paragraph (i)(1) of this AD.

(i) Other FAA AD Provisions

    The following provisions also apply to this AD:
    (1) Alternative Methods of Compliance (AMOCs): The Manager, New 
York ACO 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 certification 
office, send it to ATTN: Program Manager, Continuing Operational 
Safety, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, 
Westbury, NY 11590; telephone 516-228-7300. 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, New York ACO 
Branch, FAA; or Transport Canada; or MHI RJ Aviation ULC's Transport 
Canada Design Approval Organization (DAO). If approved by the DAO, 
the approval must include the DAO-authorized signature.

(j) Additional Information

    (1) Refer to Transport Canada AD CF-2021-38R1, dated May 25, 
2022, for related information. This Transport Canada AD may be found 
in the AD docket at regulations.gov under Docket No. FAA-2022-0679.
    (2) For more information about this AD, contact Chirayu A. 
Gupta, Aerospace Engineer, Airframe and Propulsion Section, FAA, New 
York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; 
telephone 516-228-7300; email [email protected].

(k) Material Incorporated by Reference

    None.

    Issued on April 6, 2023.
Christina Underwood,
Acting Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2023-07588 Filed 4-11-23; 8:45 am]
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