AN MD80 CONTINUOUS IGNITION SYS WAS SIGNED OFF INADVERTENTLY WITH DATA FROM A MERGED CARRIER MD80 MAINT MANUAL. ERROR IN DIFFERENT SYS.

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ON SEP/FRI/03; I WAS ASSIGNED TO WORK ON ACFT X. PIREP #X READ 'IGNITION SYS 'A' OPERATED TO EXTENDED DUTY CYCLE OF APPROX 20 MINS.' AFTER REVIEWING THE OPS MANUAL WHICH STATES 'IF CONTINUOUS IGNITION SYS IS INOP AND IGNITION IS REQUIRED INFLT; OVERRIDE SYS MAY BE OPERATED TO EXTENDED DUTY CYCLE OF 20 MINS ON; 10 MINS OFF. AN ENTRY IS REQUIRED WHEN THIS EXTENDED DUTY CYCLE IS USED.' AND AFTER REVIEWING THE ACR Y MAINT MANUAL 74-00-00 WHICH STATES A CAUTION: 'IF 20-4 JOULE EXCITER HAS BEEN OPERATED BEYOND RECOMMENDED DUTY CYCLE; UNIT MUST BE REMOVED AND CHKED PER OPERATING INSTRUCTIONS.' I ALSO REVIEWED THE 'RGMN' FOR ANY PLACARDS ON THE ACFT. SINCE THERE WAS NO PLACARD ON THE CONTINUOUS IGNITION SYS; I INTERPED THE PIREP AS THE CREW OPERATED THE IGNITION SYS IN THE 4 JOULE CONTINUOUS MODE AND STATED AS SUCH IN MY SIGNOFF FOR PIREP #X. I QUOTED AS FOLLOWS: 'SYS 'A' IGNITION DUTY CYCLE WAS USED IN CONTINUOUS 4 JOULE MODE. 4 JOULE SYS MAY BE OPERATED CONTINUOUSLY; INFO NOTED ACFT OK FOR SVC.' THE ACFT DEPARTED TO ZZZ. WHEN I RETURNED TO WORK AFTER MY WKEND; I FOUND OUT THAT WHEN THE ACFT ARRIVED IN ZZZ A PIREP WAS ADDED TO THE PIREP #Y; 'REF PIREP X HAS AN IMPROPER ACTION TAKEN; THIS ACFT HAS NO 4 JOULE SYS.' I STARTED TO DO MORE RESEARCH AND FOUND OUT THAT ACFT DO INDEED HAVE A TWIN PACK 20-20 EXCITER ADDED BY P&W SB 5880; THE TWIN PACK IS A DUAL UNIT CONTINUOUS DUTY EXCITER WITH NO DUTY CYCLE LIMITS. IN SUMMARY; I WAS INCORRECT MENTIONING THE 4 JOULE SYS IN MY INITIAL SIGNOFF. I FEEL ACR X SHOULD ALSO OFFER AN ACR Y/ACR X DIFFERENCES. THE ONLY TRAINING I HAVE HAD IS ON ACR X MD80 ACFT AND THE ACR Y ARE A DIFFERENT CONFIGN.