T-100 System ADP Specifications for U.S. Air Carriers

Department of Transportation, Research and Special Programs Administration, Office of Aviation Information Management
Number 125
Issue Date: 5/26/89
Effective Dates: 1/1/1990
Part: Part 241
Section: 241-25 (Appendix)
Subsection: T-100 Instructions

The purpose of this directive is to clarify the ADP instructions contained in the appendix to section 241.25 of CFR Part 241 - Instructions to U.S. Air Carriers for Reporting Traffic and Capacity Data an Form 41 Schedules T-100. T-1, T-2 and T-3 (Amendment No. 241.57 to CFR Part 241, 53 FR 46284, November 16, 1988).  The items covered by this directive pertain to record format, internal labeling of ADP tapes, and tape blocking factors.  It does not involve changes to the data elements as specified by the rule.

1. Paragraph E.(k)(4) mandates that a single tape file shall be used for reporting non-stop segment and on-flight market records.  In order to be consistent with the standards for fixed length record formatting, the length of each record in a file must be the same.  Therefore to assure that all records in the file are 123 characters long, please modify the On-flight Market record layout that appears in paragraph E.(J)(2) by adding an additional field as follows:

   Field No.	Positions	Mode	Description
   12	59-123	65 A	Filler (Spaces)

2. The blocking  factor for the T-100 tape file should be 250,
      
3. The blocking  factor for the T-schedule file is 1,000.
      
4. The file identification information in paragraph E.(i)(1) is incomplete.  It should read "T-1OO.System" for the T-100 non-stop segment and on-flight market tape, and "T-1OO.SCHEDULE" for the combined Schedule T-1, T-2, and T-3 data tape.

This Directive is issued under authority delegated in Part 385.27(b) (14 CFR 385.27(b)). If you have any questions on this material, please call Mr. Dick King (202) 366-4375 or Mr. Richard Strite on (202) 366-4373.

Robin A. Caldwell
Director