An Airline’s

Perspective on PMA

Michael Rennick

Manager

Component Engineering

Why PMA? A Complicated Fleet

• Delta operates a large number of fleet types

• Delta successfully operates an older fleet

Aircraft Type Current Fleet Average Age

B717–200 71 13.3

B737–700 10 6.2

B737–800 73 14.2

B737–900ER 41 0.9

B747–400 13 22.9

B757–200 122 20.1

B757–300 16 12.2

B767–300 16 24.2

B767–300ER 58 19

B767–400ER 21 14.1

B777–200ER 8 15.2

B777–200LR 10 6

A319–100 57 13.2

A320–200 69 20.1

A330–200 11 10

A330–300 23 9.6

MD–88 117 24.7

MD–90 65 18.1

Total 800 17

• To maintain our fleet to the standard

we require, we need options

• Service experience for PMAs matches

that of OEM parts and sometimes

improves upon it

• Delta has found PMA parts to be

acceptable for use throughout the

aircraft, components and engines

Why PMA? More Options

PMA coffee maker tank

Why PMA? They Work

• Delta is able to operate one of the most

reliable mainline fleets in the world

• 172 maintenance cancel free days in 2015*

(thru 9/30) while operating between 2800-3200

flights per day

100% Maintenance Cancel Free

Days

737-NG / CFM56-7B IDG

• IDGs, on all fleets, are notorious for having reliability issues

• Even while being a reliability driver Delta continues to utilize

PMAs

• Parts include rotors, bearings and critical seals

• PMA parts integrate seamlessly into our maintenance

program

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IDG - CFM56-7B

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757-200 / PW2000 Starter

• Starters are critical for completion factor

• Delta has approved over 30 PMA parts for use on this

component alone

• Delta utilizes a PMA main shaft for the starter

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Starter - PW2000

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757 / PW2000 Chip Detector

• Delta suffered a number of inflight shutdowns due to loss of

oil from improperly installed bayonet style chip detectors on

engine oil scavenge pumps

• In 2009, Delta authorized the use of a PMA screw-in chip

detector and there have been no inflight shutdowns due to

this issue since

PMA chip detectors help prevent inflight shutdowns

MD-90 T/R Blocker Door Links

• Delta started seeing failures on T/R blocker door links

• Parts usage exceeded the OEM’s ability to support

removals

• Delta was able to work with a PMA supplier to quickly

supplement our needs

• Delta was able to correct the issue with a fleet campaign

while minimizing operational disruption

Delta extensively uses PMA parts to support the

MD-90/V2500 Thrust Reversers

767 / CF6-80C2

• Delta has approved over 500 PMA parts for the 767 airframe

and components

• Over 320 PMA parts have been approved for use on the

CF6-80C2 engine

Delta utilizes a significant number of PMAs

in maintaining its engines

PMA Fuel Metering

Unit resolver gear

segment

PW2000 HPT

• HPT second stage ring and vane assembly segment was

recently approved by Delta

• The part is in the gas path

• AD related and required AMoC

Critical parts are acceptable, but they do

require additional scrutiny

The Results

• Delta has safely utilized PMA parts for over 30 years

• In the last 15 years, we have approved over 2300 PMA parts

• Delta requires allowance for PMA use in our lease agreements

• Delta has built a strong relationship with PMA vendors that allows

us to address problems much more quickly than we could with

most OEMs

• Comfort with PMA has grown to the point that they are utilized in

even the most critical applications

• Engine hot sections and rotating equipment

• Life limited parts

• Windows

• Power Generation

PMA oven timer used

on multiple fleets

100% Maintenance Cancel Free

Days

Would you like a voice in

the PMA community?

Please join the MARPA Air

Carrier Committee

Questions?

Please contact:

Michael Rennick

Michael.Rennick@delta.com

T: 404 714 0304

M: 404 824 9909