ATA: 1120

(OVER)

 SERVICE NO. 1235

 BULLETIN

PIPER CONSIDERS

COMPLIANCE MANDATORY

Piper Aircraft, Inc.

2926 Piper Drive

Vero Beach, Florida, U.S.A. 32960

Date: November 3, 2011 (M)

This Service Bulletin supersedes Service Bulletin 670 in its entirety. Compliance with this Service Bulletin is 

mandatory for all serial numbers affected, regardless of prior compliance with Service Bulletin 670.

Subject: Data plate inspection

Models Affected: Serial Numbers Affected:

PA-31T Cheyenne II 31T-7820001 through 31T-7820092

PA-31T1 Cheyenne I 31T-7804001 through 31T-7904053; 31T-7904056, 

31T-7904057

Compliance Time: At the next regularly scheduled maintenance event, but not to exceed the next 

one hundred (100) hours time in service.

Purpose: Piper has become aware that some operators have misunderstood the instructions 

in Service Bulletin 670, issued in 1979, and modified the aircraft data plate in 

error. 

This Service Bulletin provides detailed instructions for determining the aircraft 

model, based on the serial number of the aircraft. If required, this Service Bulletin 

also provides instructions for modifying the data plate to properly identify the 

aircraft model.

Instructions:

Part I. Inspection

Locate the aircraft data plate (Piper Part Number 79644-4), which is mounted on the left side of the fuselage belly, 

just below the forward part of the cabin door. Examine the markings on the data plate. 

For aircraft serial numbers 31T-7820001 through 31T-7820092, the correct aircraft model is PA-31T.

For aircraft serial numbers 31T-7804001 through 31T-7904053; 31T-7904056, and 31T-7904057, the correct 

aircraft model is PA-31T1.

•	 If the aircraft model is correctly marked on the data plate, no modification is required. Proceed to Part III 

Documentation of Compliance.

•	 If the aircraft model is incorrectly marked on the data plate, modification of the data plate is required. 

Proceed to Part II Data Plate Modification. 
SERVICE BULLETIN NO. 1235 PAGE 2 of 2

Part II. Data Plate Modification

Perform the appropriate data plate modification described below, using an acceptable method of permanent 

marking (metal stamp, engraver, electric pencil, etc.):

For aircraft serial numbers 31T-7804001 through 31T-7904053; 31T-7904056, and 31T-7904057:

•	 If the aircraft model is incorrectly marked as “MODEL PA-31T” inscribe the numeral “1” behind

“PA-31T”, so that after modification, the data plate reads “MODEL PA-31T1”.

For aircraft serial numbers 31T-7820001 through 31T-7820092:

•	 If the aircraft model is incorrectly marked as “MODEL PA-31T1” cross hatch over the numeral “1”, so 

that after modification, the data plate reads “MODEL PA-31T 1 ”.

Proceed to Part III Documentation of Compliance.

Part III. Documentation of Compliance

Make a logbook entry indicating compliance with this Service Bulletin.

MATERIAL REQUIRED: N/A

AVAILABILITY OF PARTS: N/A

Effectivity date: This Service Bulletin is effective upon receipt.

Note: Please notify the factory of any address/ownership corrections. Changes should include aircraft model, 

serial number, current owner’s name and address.

Corrections and/or changes should be directed to:

PIPER AIRCRAFT, INC.

Attn: Customer Service

2926 Piper Drive

Vero Beach, FL 32960