# AD 2016-17-09: Navigation

- Type: Airworthiness directive
- Status: Current
- Products: Bombardier CL-600-2D15 (Regional Jet Series 705) and CL-600-2D24 (Regional Jet Series 900)
- Effective: September 30, 2016
- Published: August 26, 2016, 81 FR 58827–58829
- Issued: August 17, 2016
- Issued as: Final rule
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- ATA chapter: 34 · Navigation
- Amendment: 39-18622
- Docket: FAA-2016-3990 (https://www.regulations.gov/docket/FAA-2016-3990)
- Project: 2015-NM-153-AD
- Registered aircraft: 314 may be affected, by airframe or engine model (OpenAirDocs)
- Official PDF: https://openairdocs.org/files/sha256/20/c1/20c179414c8c26b95aacdddb4ed910523f0ad9eb2e2e27277c935e844f10b6e1 (from https://www.govinfo.gov/content/pkg/FR-2016-08-26/pdf/2016-20376.pdf)
- Federal Register: https://www.federalregister.gov/documents/2016/08/26/2016-20376/airworthiness-directives-bombardier-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7F6D07B4061251CC8625801B00526761.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/2016-17-09

## Summary

We are adopting a new airworthiness directive (AD) for all Bombardier, Inc. Model CL-600-2D15 (Regional Jet Series 705) and CL-600-2D24 (Regional Jet Series 900) airplanes. This AD was prompted by two in-service incidents reported on Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) airplanes regarding a loss of all air data information in the flight deck. This AD requires revision of the airplane flight manual (AFM) to provide procedures to guide the crew to stabilize the airplane's airspeed and attitude for continued safe flight. We are issuing this AD to prevent loss of air data information that may affect continued safe flight.

## 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 (AD):

2016-17-09 Bombardier, Inc.: Amendment 39-18622; Docket No. FAA-2016-3990; Directorate Identifier 2015-NM-153-AD.

### (a) Effective Date

This AD is effective September 30, 2016.

### (b) Affected ADs

None.

### (c) Applicability

This AD applies to all Bombardier, Inc. Model CL-600-2D15 (Regional Jet Series 705) and CL-600-2D24 (Regional Jet Series 900) airplanes, certificated in any category.

### (d) Subject

Air Transport Association (ATA) of America Code 34, Navigation.

### (e) Reason

This AD was prompted by reports of two in-service incidents on Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) airplanes regarding a loss of all air data information in the flight deck. We are issuing this AD to prevent air data information loss that may affect continued safe flight.

### (f) Compliance

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

### (g) Airplane Flight Manual (AFM) Revision

Within 30 days after the effective date of this AD, revise the Emergency Procedures section of the AFM to include the information in Emergency Procedure 1., Unreliable Airspeed, of Section 03-19, Emergency Procedures—Unreliable Airspeed, of Chapter 3, Emergency Procedures, in Volume 1 of the Bombardier CRJ Series Regional Jet CL-600-2D15 and CL-600-2D24 AFM CSP C-012, Revision 11A, dated May 25, 2015.

### (h) Other FAA AD Provisions

The following provisions also apply to this AD:

  (1) Alternative Methods of Compliance (AMOCs): The Manager, New York Aircraft Certification Office (ACO), ANE-170, 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 local Flight Standards District Office, as appropriate. If sending information directly to the ACO, send it to ATTN: Assata Dessaline, Aerospace Engineer, Avionics and Services Branch, ANE 172, FAA, New York ACO, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone: 516-228-7301; fax: 516-794-5531. Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/certificate holding district office. The AMOC approval letter must specifically reference this AD.

  (2) Contacting the Manufacturer: For any requirement in this AD to obtain corrective actions from a manufacturer, the action must be accomplished using a method approved by the Manager, New York ACO, ANE-170, Engine and Propeller Directorate, FAA; or Transport Canada Civil Aviation (TCCA); or Bombardier, Inc.'s TCCA Design Approval Organization (DAO). If approved by the DAO, the approval must include the DAO-authorized signature.

### (i) Related Information

Refer to Mandatory Continuing Airworthiness Information (MCAI) Canadian AD CF-2015-08, dated 28 April, 2015, for related information. This MCAI may be found in the AD docket on the Internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2016-3990.

### (j) Material Incorporated by Reference

  (1) The Director of the Federal Register approved the incorporation by reference (IBR) 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) Section 03-19, Emergency Procedures—Unreliable Airspeed, of Chapter 3, Emergency Procedures, in Volume 1 of the Bombardier CRJ Series Regional Jet CL-600-2D15 and CL-600-2D24 Airplane Flight Manual CSP C-012, Revision 11A, dated May 25, 2015.

    (ii) Reserved.

  (3) For service information identified in this AD, contact Bombardier, Inc., 400 Côte-Vertu Road West, Dorval, Québec H4S 1Y9, Canada; Widebody Customer Response Center North America toll-free telephone: 1-866-538-1247 or direct-dial telephone: 1-514-855-2999; fax 514-855-7401; email: ac.yul@aero.bombardier.com; Internet: http://www.bombardier.com.

  (4) You may view this service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, WA. For information on the availability of this material at the FAA, call 425-227-1221.

  (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, call 202-741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html.

## Rule preamble

### Dates

This AD is effective September 30, 2016.

The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD as of September 30, 2016.

### Addresses

For service information identified in this final rule, contact Bombardier, Inc., 400 Côte-Vertu Road West, Dorval, Québec H4S 1Y9, Canada; Widebody Customer Response Center North America toll-free telephone: 1-866-538-1247 or direct-dial telephone: 1-514-855-2999; fax 514-855-7401; email: ac.yul@aero.bombardier.com; Internet: http://www.bombardier.com. You may view this referenced service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, WA. For information on the availability of this material at the FAA, call 425-227-1221. It is also available on the Internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2016-3990.

### For further information contact

Assata Dessaline, Aerospace Engineer, Avionics and Services Branch, ANE-172, FAA, New York Aircraft Certification Office (ACO), 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone: 516-228-7301; fax: 516-794-5531.

### Discussion

We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 by adding an AD that would apply to all Bombardier, Inc. Model CL-600-2D15 (Regional Jet Series 705) and CL-600-2D24 (Regional Jet Series 900) airplanes. The NPRM published in the Federal Register on March 4, 2016 (81 FR 11467) (“the NPRM”). The NPRM was prompted by two in-service incidents reported on Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) airplanes regarding a loss of all air data information in the flight deck. The NPRM proposed to require revision of the airplane flight manual (AFM) to provide procedures to guide the crew to stabilize the airplane's airspeed and attitude for continued safe flight. We are issuing this AD to prevent loss of air data information that may affect continued safe flight.

Transport Canada Civil Aviation (TCCA), which is the aviation authority for Canada, has issued Canadian AD CF-2015-08, dated April 28, 2015 (referred to after this as the Mandatory Continuing Airworthiness Information, or “the MCAI”), to correct an unsafe condition for all Bombardier, Inc. Model CL-600-2D15 (Regional Jet Series 705) and CL-600-2D24 (Regional Jet Series 900) airplanes. The MCAI states:

Two in-service incidents have been reported on CL-600-2C10 aeroplanes regarding a loss of all air data information in the cockpit. The air data information was recovered as the aeroplane descended to lower altitudes. An investigation determined that the root cause in both events was high altitude icing (ice crystal contamination). If not addressed, this condition may affect continued safe flight.

Due to similarities in the air data systems, such events could happen on all Bombardier CRJ models, CL-600-2B19, CL-600-2C10, CL-600-2D15, CL-600-2D24 and CL-600-2E25. Therefore, the corrective actions for these models will be mandated once their respective Airplane Flight Manual (AFM) revisions become available.

This [Canadian] AD mandates the incorporation of AFM procedures to guide the crew to stabilize the aeroplanes airspeed and attitude for continued safe flight.

You may examine the MCAI in the AD docket on the Internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2016-3990.

### Comments

We gave the public the opportunity to participate in developing this AD. The following presents the comments received on the NPRM and the FAA's response to each comment.

### Request for Further Investigation

The Air Line Pilots Association stated that the AFM revision will not address the root cause of the high-altitude icing (ice crystal contamination), and requested that further investigation be done for the ice crystal contamination issue and remedies be provided in addition to the AFM amendments.

We agree that the AFM revision will not address the root cause of the high-altitude icing (ice crystal contamination). The manufacturer is investigating the issue, but there is no timetable for a final resolution. Should the manufacturer develop modifications to prevent this problem, the FAA will consider further rulemaking. The incorporation of the AFM procedures is meant to be used to guide the crew on how to stabilize the airplane airspeed and altitude for continued safe flight in icing conditions. However, further investigation into this matter extends beyond the scope of this AD.

### Conclusion

We reviewed the relevant data, considered the comment received, and determined that air safety and the public interest require adopting this AD as proposed except for minor editorial changes. We have determined that these minor changes:

• Are consistent with the intent that was proposed in the NPRM for correcting the unsafe condition; and

• Do not add any additional burden upon the public than was already proposed in the NPRM.

### Related Service Information Under 1 CFR Part 51

Bombardier, Inc. has issued Emergency Procedure 1., Unreliable Airspeed, of Section 03-19, Emergency Procedures—Unreliable Airspeed, of Chapter 3, Emergency Procedures, in Volume 1 of the Bombardier CRJ Series Regional Jet CL-600-2D15 and CL-600-2D24 Airplane Flight Manual CSP C-012, Revision 11A, dated May 25, 2015. The service information describes procedures to guide the crew to stabilize the airplane's airspeed and attitude for continued safe flight. 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.

### Interim Action

Required actions in this AD apply only to Bombardier, Inc. Model CL-600-2D15 (Regional Jet Series 705) and CL-600-2D24 (Regional Jet Series 900) airplanes. We may consider issuing further rulemaking on the other Bombardier airplane models identified previously.

### Costs of Compliance

We estimate that this AD affects 230 airplanes of U.S. registry.

We estimate the following costs to comply with this AD:

*Estimated Costs*

| Action | Labor cost | Cost per product | Cost on U.S. operators |
| --- | --- | --- | --- |
| AFM revision | 1 work-hour × $85 per hour = $85 | $85 | $19,550 |

### 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.

We are 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

We determined that 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. Is not a “significant rule” under the DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979);

3. Will not affect intrastate aviation in Alaska; and

4. 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.

### Adoption of 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 A21EA-1](https://openairdocs.org/tcds/A21EA-1): MHI RJ Aviation ULC; names 2 of 9 models: CL-600-2D15 (Regional Jet Series 705), CL-600-2D24 (Regional Jet Series 900)

## 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: 314 (314 by airframe model, 0 by engine model)
- Makers: Bombardier 314

Models with the most aircraft:

- [Bombardier CL-600-2D24](https://openairdocs.org/model/bombardier-cl-600-2d24): 314 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/2016-17-09/models.md
Every aircraft: https://openairdocs.org/ad/2016-17-09/aircraft.md

## Related documents

- [Proposed rule FAA-2016-3990](https://openairdocs.org/proposed/FAA-2016-3990): Notice of proposed rulemaking (NPRM), published Mar 4, 2016

Its text cites no advisory circulars or STCs.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.