Where's it found
ABBV
AD numbering system
AC numbering system
Misc.
100

Placards requirements

Maintenance manual (Aircraft specification) or TCDS

100

IPC, AC

Illustrated Parts Catalog, Advisory Circular

100

AD# 85-26-23

What does 85 mean

Year of 1985

100

25-42-C

Explain what 25 means

it means this AC refers to the 25th part of the FAR

100

You need two copies of each AD compliance, where are they kept?

OK city for the FAA, and the logbook for the aircraft

200

Part numbers

Illustrated Parts Catalog IPC

200

AMM

Aircraft Maintenance Manual

200

85-26-23

What does 26 mean

Bi-weekly number 26, bi-weeks in a year

26 is second half of December

200

25-42-C

explain what the 42 means

42 is the sequential number, so the 42nd AC of that part

200

When are AD's issued?

To correct unsafe conditions or deficiencies that are likely to occur in others of it's type

300

What manual to reference to install an aircraft seat

Aircraft Maintenance Manual (AMM)
300

SRM

Structural Repair Manual

300

85-26-23

What does 23 mean

Sequential number, so in this case the twenty third AD of that bi-week of that year

300

25-42-C

Explain the C

the revision letter, so in this case this is the third revision of this AC

FUNFACT!!! previous revisions of an AC are automatically discontinued

300

What does the FAA issue AC's for?

Guidelines for acceptable practices of the FARs

400

Where would the records for a 100 hour inspection be kept, if logs for Airframe, Engine, and Powerplant are separate 

In each individual logbook

400

FSDO

Flight Standard District Office

400

24-1-4

Describe what each number means

year: 2024

first two weeks of january

4th AD of that bi-week and year

400

43-19-G

Explain Each number and Letter

43rd part of the FARs

19th AC discussing the FARs

G= 7th revision of this AC

400

What is issued by the Aircraft Manufacturer to correct design defects?

Service bulletins 

500

Where would you check if an aircraft is using the correct engine, and where to find approved engines

TCDS

500

SA, SE, SC

These are prefixes for Supplemental Type Certificate names. Supplemental Airframe, Supplemental Engine, Supplemental Component

500

70-13-7

Explain what each number means 

Year 1970

later two weeks of June

7th AD of that bi-week

500

1-1-A

Explain each number and letter

AC discusses part 1 of the FARs

First AC of that part

A= first draft of this AC

500

What items are type certificated?

Airframes, Engines, Propellers