A Mechanic reports he may have failed to comply with a procedure contained in the Configuration Deviation List (CDL) for a B757-200; with an air conditioning door latch locking feature not secured.

Narrative

In December 2008; may have failed to comply with procedure contained in Configuration Deviation List (CDL) for the air conditioning door latch. After reviewing the facts given to me by the AMT; that the door latch was functional and that it just was hanging down after positive latching. I reviewed the MEL; CDL; and Nonessential Equipment and Furnishings (NEF) and found that this condition was not covered by those documents; but that the use of metallic tape was covered by Procedures Manual 17-07 which states; 'In general; use of metallic tape should be confined to applications and areas where structural or aerodynamic integrity would not be affected.' I advised the AMT of the requirements of and guidelines and decided that to give more visibility and a timelier repair that I would issue a Maintenance Tracking Item covered under Procedures Manual 17-21. The CDL only covers the door missing and the condition described by the AMT; the door was in good condition and would latch properly and that only the latch locking feature was hanging down. This is the reason I cold not use the CDL.