# AD 2011-18-11: Flight Controls

- Type: Airworthiness directive
- Status: Current
- Products: Viking Air DHC-3
- Effective: October 3, 2011
- Published: August 29, 2011, 76 FR 53633–53636
- Issued: August 19, 2011
- Issued as: Final rule
- Supersedes: [AD 2011-05-02](https://openairdocs.org/ad/2011-05-02)
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-16793
- Docket: FAA-2011-0597 (https://www.regulations.gov/docket/FAA-2011-0597)
- Project: 2011-CE-019-AD
- Registered aircraft: 76 may be affected, by airframe or engine model (OpenAirDocs)
- Official PDF: https://openairdocs.org/files/sha256/f3/8b/f38b3f13c4b45ba913cfd220aed41e7abceb5eb182dad5af6d654d17ae817cc1 (from https://www.govinfo.gov/content/pkg/FR-2011-08-29/pdf/2011-21876.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/08/29/2011-21876/airworthiness-directives-viking-air-limited-type-certificate-no-a-815-formerly-held-by-bombardier
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A12CA90E8912318A862578FB0046E92D.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/2011-18-11

## Summary

We are superseding an existing airworthiness directive (AD) for all Viking Air Limited (type certificate No. A-815 formerly held by Bombardier Inc. and de Havilland, Inc.) Model DHC-3 airplanes. That AD currently requires repetitively inspecting the elevator control tabs for discrepancies, taking necessary corrective actions to bring all discrepancies within acceptable tolerances, and reporting certain inspection results to the FAA. This new AD retains the actions currently required in AD 2011-05-02 and removes the Supplemental Type Certificate (STC) SA01059SE condition in the Applicability section. This AD was prompted by our determination that we inadvertently omitted certain airplanes from the Applicability section. We are issuing this AD to correct the unsafe condition on these products.

## The airworthiness directive

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

## Rule preamble

### Dates

This AD is effective October 3, 2011.

The Director of the Federal Register approved the incorporation by reference of certain other publications listed in this AD as of March 31, 2011 (76 FR 10220, February 24, 2011).

### Addresses

For information about the revisions to the FAA-approved maintenance/inspection program identified in this AD, contact Viking Air Ltd., 9574 Hampden Road, Sidney, BC Canada V8L 5V5; telephone: (800) 663-8444; Internet: http://www.vikingair.com. You may review copies of the referenced revisions at the FAA, Small Airplane Directorate, 901 Locust, Kansas City, Missouri 64106. For information on the availability of this material at the FAA, call 816-329-4148.

### For further information contact

George Duckett, Aerospace Engineer, FAA, New York Aircraft Certification Office, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone: (516) 228-7325; fax: (516) 794-5531; email: george.duckett@faa.gov.

### Discussion

We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 to supersede AD 2011-05-02, Amendment 39-16611 (76 FR 10220, February 24, 2011). That AD applies to the specified products. The NPRM published in the Federal Register on June 10, 2011 (76 FR 34011). That NPRM proposed to retain all of the requirements of AD 2011-05-02 and add airplanes to the Applicability section removing the Supplemental Type Certificate (STC) SA01059SE condition.

### Comments

We gave the public the opportunity to participate in developing this AD. We received no comments on the NPRM or on the determination of the cost to the public.

### Conclusion

We reviewed the relevant data and determined that air safety and the public interest require adopting the 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.

### Interim Action

We are continuing to evaluate the cause of the unsafe condition identified in this AD to enable us to obtain better insight into the nature, cause, and extent of excessive free-play in the elevator control tabs. Based on this evaluation, we may consider further rulemaking.

### Costs of Compliance

We estimate that this AD affects 65 airplanes of U.S. registry.

We estimate the following costs to comply with this AD:

*Estimated Costs*

| Action | Labor cost | Parts cost | Cost per product | Cost on U.S. operators |
| --- | --- | --- | --- | --- |
| Inspection | 1 work-hour × $85 per hour = $85 per inspection cycle | Not applicable | $85 per inspection cycle | $5,525 per inspection cycle. |

We estimate the following costs to do any necessary follow-on actions that will be required based on the results of the inspection. We have no way of determining the number of airplanes that may need this repair/replacement:

*On-Condition Costs*

| Action | Labor cost | Parts cost | Cost per product |
| --- | --- | --- | --- |
| Minimum repair | 1 work-hour × $85 per hour = $85 | $50 | $135 |
| Moderate repair | 3 work-hours × $85 per hour = $255 | 150 | 405 |
| Maximum repair | 6 work-hours × $85 per hour = $510 | 450 | 960 |

### 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 have 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 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 A-815](https://openairdocs.org/tcds/A-815): De Havilland Aircraft of Canada Limited; names 1 of 1 models: DHC-3

## 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: 76 (76 by airframe model, 0 by engine model)
- Makers: Dehavilland 67, Dehavilland Canada 8, Dehavilland-Hansen 1

Models with the most aircraft:

- [Dehavilland DHC-3](https://openairdocs.org/model/dehavilland-dhc-3): 67 aircraft (airframe model)
- [Dehavilland Canada DHC-3](https://openairdocs.org/model/dehavilland-canada-dhc-3): 8 aircraft (airframe model)
- [Dehavilland-Hansen DHC-3](https://openairdocs.org/model/dehavilland-hansen-dhc-3): 1 aircraft (airframe model)

All 5 models: https://openairdocs.org/ad/2011-18-11/models.md
Every aircraft: https://openairdocs.org/ad/2011-18-11/aircraft.md

## Related documents

- [AD 2011-05-02](https://openairdocs.org/ad/2011-05-02) (historical): Flight Controls · Viking Air DHC-3 with STC SA01059SE. Effective Mar 31, 2011. Replaced by this AD
- [Proposed rule FAA-2011-0597](https://openairdocs.org/proposed/FAA-2011-0597): Notice of proposed rulemaking (NPRM), published Jun 10, 2011
- [STC SA01059SE](https://openairdocs.org/stc/SA01059SE): Installation of a new elevator servo-tab and redundant control linkage. American Aeromotives Inc., Cited in the text

## NTSB investigations that cite this AD (2)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB ANC15LA037](https://openairdocs.org/ntsb/ANC15LA037), Jun 4, 2015: Dehavilland DHC-3T (N3125N), Skwentna, AK, substantial damage. Probable cause: The flutter failure of the right elevator servo tab due to the improper fabrication of the servo tab and maintenance personnel’s subsequent failure to detect anomalies with the servo tab.
- [NTSB ANC14LA035](https://openairdocs.org/ntsb/ANC14LA035), May 30, 2014: Dehavilland DHC-3T (N3125N), Homer, AK, substantial damage. Probable cause: The flutter failure of the right elevator servo tab due to the improper fabrication of the servo tab and maintenance personnel’s subsequent failure to detect anomalies with the servo tab.

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