### 8 Regulatory Evaluation

Docket No. FAA

- 

### 2011

- 0961 Directorate Identifier: 

### 2 011

- NE

- 22

- A D

If you make changes to the values in the table below, you must ensure the totals update accordingly. If

they do not, click (or Tab) into and then out of the changed cell

.

Estimated Costs:

Action

(e.g., Inspection,

replacement)

Do not include on

condi tion costs here Costs per Product (e.g., aircraft, engine,

propeller, appliance)

Work

- hours

(include

access, testing,

and close

- up) Labor

cost

(@$85/h

our) Parts Cost Total Costs

(labor +

parts) Number of

U.S.

Registered

Products Total Cost

for U.S. Flee t



### Inspect 3rd and 4th

stage wheels at

1,750 hours when

the turbine is

already

disassembled. 1.0 $ 85.00 $ 85.00 3,769 $ 320,365.00



### Inspect 3rd and 4th

stage wheels

following a hot

start (remove

engine from

aircraft, remove

wheels from

engine, inspect,

reassemble engine,

reinstall engine in

aircra ft) 27.0 $ 2,295.0

0 $ 2,295.00 

### 19 $ 43,605.00

$ 0.00 $ 0.00 $ 0.00

$ 0.00 $ 0.00 $ 0.00

$ 0.00 $ 0.00 $ 0.00

$ 0.00 $ 0.00 $ 0.00

$ 0.00 $ 0.00 $ 0.00

$ 0.00 $ 0.00 $ 0.00

$ 0.00 $ 0.00 $ 0.00

$ 0.00 $ 0.00 $ 0.00

$ 0.00 $ 0.00 $ 0.00

$ 0.00 $ 0.00 $ 0.00

$ 0.00 $ 0.00 $ 0.00

$ 0.00 $ 0.00 $ 0.00

$ 0.00 $ 0.00 $ 0.00

$ 0.00 $ 0.00 $ 0.00

$ 0.00 $ 0.00 $ 0.00

$ 0.00 $ 0.00 $ 0.00

$ 0.00 $ 0.00 $ 0.00

$ 0.00 $ 0.00 $ 0.00



### The known number of products in compliance: 

### 0

Total Costs of compliance for U.S. fleet: $ 363,970

### 9 Costs covered under warranty ( i f known ) $ 0

On

- Condition Costs:

Action

(e.g., Inspe ction,

replacement) Work

- hours

(include access,

testing, and close

up) Labor cost

(@$85/hour) Parts Cost Cost per Product

$ 0.00 $ 0.00

$ 0.00 $ 0.00

$ 0.00 $ 0.00

$ 0.00 $ 0.00



### Special considerations for Economic Analysis (Use this field to explain anything in the Estimated Costs table

that was assumed or might not be obvious. This field can also be used to explain warranty costs) 

### : 

### The majority of

turbine wheel inspections will occur at the schedued gas producer turbine overhaul at 1,750 hours.

In that case, the total time to inspect the wheels will be 1.0 hours. A very small number of engines

will be inspected following a hot start. This is not a frequent occurrence, but it is conservatively

estimated to be 0.5 % of the total. For those engines, the total time to remove the engine from the

aircraft, remove the wheel s from the engine, inspect them, reassemble the engine a nd reinstall the

engine in the aircraft will be 27.0 hours. Finally, from all inspections, it is estimated that 40 % of

the engines will need to have their third stage wheels replaced and 3% are estimated to need to

have their fourth stage wheel replaced

. This is a conservative estimate. To help put this number

into perspective, there have been a total of 7 failures in over 1,000,000 hours for a rate of 5.2E

- 6

events/hour.

Executive Order 12866:

Could the AD be considered a “significant regulatory actio n”?

YES * NO

* Explanation:

DOT Regulatory Policies and Procedures:

Is the AD significant?

YES * NO

* Explanation:

Regulatory Flexibility Act:

Will the AD have a significant economic impact on a substantial number of small entities? E xplain for

either a Yes or No answer.

YES NO

Explanation:

Intrastate Aviation in Alaska:

This AD could affect intrastate aviation in Alaska. Is it appropriate to include specific requirements for

aircraft operated in Alaska where aviation might be the only mode of transportation?

YES * NO



### * Explanation 

### :

### 10 Record of Discussion

Docket No. FAA

- Directorate Identifier:

- AD

With whom outside the FAA has this action been discussed (i.e., Design Approval Holder,

manufacturer, ATA, NBAA, RAA, AOPA, ALPA, GAMA, etc) ?

ORGANIZATION PERSON CONTACTED DATE TOPICS DISCUSSED



### Rolls

- Royce

Corporation Rob Andrus 7/25/2014 Concur.



### Other/Additional Information:

### 11 Signature Section

Signature indicates concurrence with this action.

Originating Office Tracking No. :

ASE Date

COS Focal ( optional ) Date

Branch Manager Date

AEG Representative (except for appliances) 

### Date

MIDO/ CMO/ MIO Representative * Date

*Signature required if a QC problem is involved.

EIR NUMBER (MIDO/ CMO/ MIO use only)

ACO/Staff Office Manager Date