# AD 2022-23-07: Auto-Flight

- Type: Airworthiness directive
- Status: Current
- Products: BAE Systems BAe 146-100A, BAe 146-200A and BAe 146-300A
- Effective: January 4, 2023
- Published: November 30, 2022, 87 FR 73446–73448
- Issued: November 1, 2022
- Issued as: Final rule
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- ATA chapter: 22 · Auto flight
- Amendment: 39-22234
- Docket: FAA-2022-1053 (https://www.regulations.gov/docket/FAA-2022-1053)
- Project: MCAI-2022-00200-T
- Registered aircraft: 8 may be affected, by airframe or engine model (OpenAirDocs)
- Official PDF: https://openairdocs.org/files/sha256/aa/e5/aae56ee365fc8fc8ef516cb1825b00402bb25fbbeffe94661b064dc78cbe0e4f (from https://www.govinfo.gov/content/pkg/FR-2022-11-30/pdf/2022-26083.pdf)
- Federal Register: https://www.federalregister.gov/documents/2022/11/30/2022-26083/airworthiness-directives-bae-systems-operations-limited-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADFRAWD-2022-26083-0000000000.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/2022-23-07

## Summary

The FAA is adopting a new airworthiness directive (AD) for all BAE Systems (Operations) Limited Model BAe 146 series airplanes. This AD was prompted by a finding that when the autopilot is engaged, the architecture of the autopilot system does not automatically disconnect the autopilot in response to pilot application of a pitch input or when the electric pitch trim switch on either pilot control wheel is operated. This AD requires modifying the autopilot engagement circuit. The FAA is issuing this AD to address the unsafe condition on these products.

## The airworthiness directive

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

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

2022-23-07 BAE Systems (Operations) Limited Amendment 39-22234; Docket No. FAA-2022-1053; Project Identifier MCAI-2022-00200-T.

### (a) Effective Date

This airworthiness directive (AD) is effective January 4, 2023.

### (b) Affected ADs

None.

### (c) Applicability

This AD applies to all BAE Systems (Operations) Limited Model BAe 146-100A, -200A, and -300A airplanes, certificated in any category.

### (d) Subject

Air Transport Association (ATA) of America Code 22, Auto-Flight.

### (e) Unsafe Condition

This AD was prompted by a finding that when the autopilot is engaged, the architecture of the autopilot system does not automatically disconnect the autopilot in response to pilot application of a pitch input or when the electric pitch trim switch on either pilot control wheel is operated. The FAA is issuing this AD to address continued autopilot engagement after flightcrew input to disengage the autopilot, which could lead to reduced controllability of the airplane.

### (f) Compliance

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

### (g) Modification

Within 12 months after the effective date of this AD, modify the autopilot engagement circuit in accordance with the Accomplishment Instructions of BAE Systems (Operations) Limited Modification Service Bulletin SB.22-072-36262A, dated September 14, 2021.

### (h) No Reporting Requirement

Although BAE Systems (Operations) Limited Modification Service Bulletin SB.22-072-36262A, dated September 14, 2021, specifies to submit certain information to the manufacturer, this AD does not include that requirement.

### (i) Other 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 information directly to the International Validation Branch, send it to the attention of the person identified in paragraph (j)(2) of this AD. Information may be emailed to: 9-AVS-AIR-730-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 the United Kingdom Civil Aviation Authority (U.K. CAA); or BAE Systems (Operations) Limited's U.K. CAA Design Organization Approval (DOA). If approved by the DOA, the approval must include the DOA-authorized signature.

### (j) Additional Information

  (1) Refer to U.K. CAA AD G-2022-0002, dated February 11, 2022, for related information. This U.K. CAA AD may be found in the AD docket at regulations.gov under Docket No. FAA-2022-1053.

  (2) For more information about this AD, contact Todd Thompson, Aerospace Engineer, Large Aircraft Section, FAA, International Validation Branch, 2200 South 216th St., Des Moines, WA 98198; telephone 206-231-3228; email todd.thompson@faa.gov.

### (k) Material Incorporated by Reference

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

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

    (i) BAE Systems (Operations) Limited Modification Service Bulletin SB.22-072-36262A, dated September 14, 2021.

    (ii) [Reserved]

  (3) For service information identified in this AD, contact BAE Systems (Operations) Limited, Customer Information Department, Prestwick International Airport, Ayrshire, KA9 2RW, Scotland, United Kingdom; telephone +44 1292 675207; fax +44 1292 675704; email RApublications@baesystems.com; website baesystems.com/Businesses/RegionalAircraft/index.htm.

  (4) You may view this service information 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 service information that is incorporated by reference at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, email fr.inspection@nara.gov, or go to: www.archives.gov/federal-register/cfr/ibr-locations.html.

## Rule preamble

### Dates

This AD is effective January 4, 2023.

The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD as of January 4, 2023.

### Addresses

AD Docket: You may examine the AD docket at regulations.gov under Docket No. FAA-2022-1053; 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, 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.

Material Incorporated by Reference:

• For service information identified in this final rule, contact BAE Systems (Operations) Limited, Customer Information Department, Prestwick International Airport, Ayrshire, KA9 2RW, Scotland, United Kingdom; telephone +44 1292 675207; fax +44 1292 675704; email RApublications@baesystems.com; website baesystems.com/Businesses/RegionalAircraft/index.htm.

• You may view this service information 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. It is also available at regulations.gov under Docket No. FAA-2022-1053.

### For further information contact

Todd Thompson, Aerospace Engineer, Large Aircraft Section, FAA, International Validation Branch, 2200 South 216th St., Des Moines, WA 98198; telephone 206-231-3228; email todd.thompson@faa.gov.

### Background

The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 by adding an AD that would apply to all BAE Systems (Operations) Limited Model BAe 146 series airplanes. The NPRM published in the Federal Register on August 22, 2022 (87 FR 51271). The NPRM was prompted by AD G-2022-0002, dated February 11, 2022, issued by United Kingdom Civil Aviation Authority (U.K. CAA), which is the aviation authority for the United Kingdom (referred to after this as the MCAI). The MCAI states that when the autopilot is engaged, the architecture of the autopilot system does not automatically disconnect the autopilot in response to pilot application of a pitch input or when the electric pitch trim switch on either pilot control wheel is operated.

In the NPRM, the FAA proposed to require modifying the autopilot engagement circuit. The FAA is issuing this AD to address continued autopilot engagement after flightcrew input to disengage the autopilot, which could lead to reduced controllability of the airplane.

You may examine the MCAI in the AD docket at regulations.gov under Docket No. FAA-2022-1053.

### Comments

The FAA received no comments on the NPRM or on the determination of the cost to the public.

### Conclusion

This product has been approved by the aviation authority of another country and is approved for operation in the United States. Pursuant to the FAA's bilateral agreement with this State of Design Authority, it has notified the FAA of the unsafe condition described in the MCAI referenced above. The FAA reviewed the relevant data and determined that air safety requires adopting this AD as proposed. Accordingly, the FAA is issuing this AD to address the unsafe condition on this product. Except for minor editorial changes, this AD is adopted as proposed in the NPRM. None of the changes will increase the economic burden on any operator.

### Related Service Information Under 1 CFR Part 51

BAE Systems (Operations) Limited has issued Modification Service Bulletin SB.22-072-36262A, dated September 14, 2021. This service information describes procedures for modifying the autopilot engagement circuit, including the wiring, relay, and certain module blocks. This service information is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in the ADDRESSES section.

### Costs of Compliance

The FAA estimates that this AD affects 20 airplanes of U.S. registry. The FAA estimates the following costs to comply with this AD:

*Estimated Costs for Required Actions*

| Labor cost | Parts cost | Cost per product | Cost on U.S. operators |
| --- | --- | --- | --- |
| 130 work-hours × $85 per hour = $11,050 | $2,124 | $13,174 | $263,480 |

### Authority for This Rulemaking

Title 49 of the United States Code specifies the FAA's authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. Subtitle VII: Aviation Programs, describes in more detail the scope of the Agency's authority.

The FAA is issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701: General requirements. Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.

### Regulatory Findings

This AD will not have federalism implications under Executive Order 13132. This AD will not have a substantial direct effect on the States, on the relationship between the national government and the States, or on the distribution of power and responsibilities among the various levels of government.

For the reasons discussed above, I certify that this AD:

  (1) Is not a “significant regulatory action” under Executive Order 12866,

  (2) Will not affect intrastate aviation in Alaska, and

  (3) Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.

### The Amendment

Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A49EU](https://openairdocs.org/tcds/A49EU): BAE Systems (Operations) Limited; names 3 of 6 models: BAe 146-300A, BAe 146-100A, BAe 146-200A

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 8 (8 by airframe model, 0 by engine model)
- Makers: British Aerospace 8

Models with the most aircraft:

- [British Aerospace BAE 146 SERIES 200A](https://openairdocs.org/model/british-aerospace-bae-146-series-200a): 8 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/2022-23-07/models.md
Every aircraft: https://openairdocs.org/ad/2022-23-07/aircraft.md

## Related documents

- [Proposed rule FAA-2022-1053](https://openairdocs.org/proposed/FAA-2022-1053): Notice of proposed rulemaking (NPRM), published Aug 22, 2022

Its text cites no advisory circulars or STCs.

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