Presented to:

By:

Date:

Federal Aviation ECi Cylinder Administration

Airworthiness 

Directive

Comparison of 

Recommendations

NTSB

Wayne Maguire, FAA, Eng. & Prop. Directorate

June 9, 2015
Federal Aviation

Administration

Comparison of 

ECi, NTSB, & FAA

Recommendations

NTSB Meeting

June 9, 2015

For Internal FAA Use Only 2
Federal Aviation

Administration

FAA NPRM & ECi Recommendation

NTSB Meeting

June 9, 2015

For Internal FAA Use Only 3

TBO

1000

500

TIS (hrs)

ECi Cylinder Serial Number

1 33696 33697 61176

Remove

750

25526 25527 64016

Remove

or calibrate CHT

ECi June 2011 recommendation: Repetitive 50 Hr inspections & removals

Remove

ECi Feb 2013 recommendation: Pilots over-temp engines

Remove @ 750 hrs

Group A Group B

Remove @ 1000 hrs
Federal Aviation

Administration

NTSB 2012 Safety Rec A-12-7:

NTSB Recommendations

NTSB Meeting

June 9, 2015

For Internal FAA Use Only 4

TBO

1000

500

TIS (hrs)

ECi Cylinder Serial Number

Repetitive

Inspections

1 33697 61176

Remove

750

25526 25527 64016

Remove; or calibrate CHT, 

do repetitive inspections,

and remove at TBO

Remove

Remove

750

25526 25527

Remove; or calibrate CHT, 

do repetitive inspections,

and remove at TBO

Remove

7709

Repetitive

Inspections,

Remove @ TBO

No

Action

(2013 recommendation:

Pilots over-temp engines)

(2013 recommendation:

Pilots over- engines)

52884

1043

No Action, AD

(but S/N 7708

separated)

No Action

Repetitive

Inspections (R/I),

Remove @ TBO

No Action,

SB & SAIB

No Action

(except for 165 S/Ns

R/I and remove)

36209

NTSB 2013 NPRM Comment Letter Recommendation:
Federal Aviation

Administration

ECi NPRM, history (cont.)

NTSB recommendations.

NTSB Meeting

June 9, 2015

For Official Use Only 5

S/N Range NTSB Reason FAA Comment

1 – 1043 Not investigated, no concerns 

raised.

FAA disagrees:

1) Insufficient head assembly 

interference fit.

2) 2004 AD campaigned limited s/n’s 

having insufficient heat treat.

3) s/n 7708 failed & separated. 

1044 - 7708 Already covered by FAA AD.

7709 – 33696 1) Already covered by ECi

MSB 06-2 50 hr repetitive 

compression & bubble checks for 

cylinders >500 hrs TIS.

2) SAIB already exists.

3) Do repetitive inspections and 

remove at TBO.

FAA disagrees:

1) This population experiences dome 

radius failures <500 hrs TIS.

2) MSB 06-2 applies to only rev D 

castings... none later.

3) SAIB focuses on thin wall exhaust 

valve seat cracks which don’t lead to 

head separations... not mandated.
Federal Aviation

Administration

ECi NPRM, history (cont.)

NTSB recommendations.

NTSB Meeting

June 9, 2015

For Official Use Only 6

S/N Range NTSB Reason FAA Comment

33697 – 36209 Repetitive Inspections and 

remove at TBO.

FAA disagrees:

1) Probability of crack detection and/or 

crack propagation rate reduces 

effectiveness of repetitive inspections.

2) Insufficient head assembly 

interference fit.

36210 – 61176 Apply NTSB safety rec 

(repetitive inspections and 

removal at TBO) from 33697 to 

36209 to the 165 specific serial 

numbers identified by ECi

within this s/n range.

FAA disagrees:

1) Failures are occurring, and are not 

limited to the 165 cylinders having 

interference fits <.010”

2) ECi has yet to make sufficient design 

or manufacturing improvements.

>61176 No airworthiness action 

needed.

FAA agrees.
Federal Aviation

Administration

NTSB 2012 NPRM Safety Rec A-12-7:

FAA Challenge Team

NTSB Meeting

June 9, 2015

For Internal FAA Use Only 7

TBO

1160

1000

TIS

-

h

r

s

Time-in-Service (TIS) - hrs

0 680 1000 TBO

TBO-160

SNPRM Compliance Plan

840

Remove

No Mandated

Inspections

All O/H’ed

Cylinders

Remove within

80 hrs TIS