### Regulatory Evaluation
Docket No. FAA- 

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# 39 Directorate Identifier: 

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# 0 Add the work hours, pm·ts cost, and number of U.S. registered products to the table below
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E stimated Costs : Action Costs per Product (e.g. , aircraft, engine , prop eller , appliance) (e.g. , Inspect ion, Work-hours Labor Parts Cost Total Costs Number of Tota l C ost replacement) (inc lude cos t (labor + 

## u.s. for U.S. F leet Do n ot includ e on- condition costs here access, testing, (@ $8 5/h parts) Registered and close-up) our) Products X-Ray Inspection 8 180 

### 555 I Eddy Current I 0 

### 555 Inspection Prepare Airp lane for 3 0 

### 555 the Inspections Visua l Inspection 1 <' I_ 0 

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c IThe known number ofproducts in compliance: 0 Total Costs of compliance for U.S
. fleet: $714 , 700 Costs covered under warranty (if kn o wn) $0 On

- Condition Costs: 

# G Action Work-hours Labor cost Parts Cost Cost per Product (e
.g. , Inspection, (include acces s, (@$85/bour)

replacement) testing, and closeup)



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### We have no way of knowing the extent ofcracks that may be found during the required inspections. Therefore , we have no way of determining the cost of the corrective action.

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### Special considerations for Economic Analysis (U se this field to explain anything in the Estimated C osts table that was assumed or mi g ht not b e obvi o us. This field c an also be us ed to explain warranty costs): 

### Executive Order 12866: Could the AD be considered a "significant regulatory action" ? 

# G YES* D NO D *Explanation: This will be an Immediate Adopted Rule (IAR) that is significant regulatory action because the possibility exists that an airplane may lose an engine without these mandatory inspections. These inspections are looking for cracks under structure that cannot be detected visually without dismantling structure that covers up areas where cracks have been found to exist. 

### DOT Regulatory Policies and Procedures: Is the AD significant? 

# G YES* D NO D *Explanation: The AD is significant because cracks are being found in locations where AD 97-26

- 16 inspections are not required. Cracks have been found on engine mount beams in high usage airplanes where the structure prevents visual detection until the cracks have grown such that the structural integrity is no longer maintained. The inspections are looking for cracks that cannot be detected visually without dismantling structure that covers up areas where cracks have been found to exist. 

### Regulatory Flexibility Act: Will the AD have a significant economic impact on a substantial number of small entities? Explain for either a Yes or No answer . 

# G Y E S D NO D Explanation: Cape Air has 84 ofthe 167 Cessna 402C airplanes in the FAA register. These inspections will have a significant economic impact because ofthe cost of these in spections and the loss ofrevenue due to the downtime required for the inspections.



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