A B717-200 DURING A GASPER FAN MODIFICATION IT WAS DISCOVERED THE ENGINEERING DRAWING WAS IN ERROR. COMPONENTS LOCATIONS ALL WRONG.

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ON NOV/THU/02; TRYING TO ACCOMPLISH AN ENGINEERING ORDER ON ACFT X; I FOUND THAT I COULD NOT ACCOMPLISH SOME OF THE TASKS AS DESCRIBED. THE FIRST 5 STEPS WERE OK AND WENT AHEAD TO ACCOMPLISH THESE TASKS; WHICH INCLUDED REMOVING THE GASPER FAN AND INSTALLING A NEW (MODIFIED) FAN. THE NEW FAN HAS A DRAIN LINE THAT NEEDED TO BE INSTALLED. THIS IS WHERE THE PROB EXISTS. DURING INSTALLATION; I FOUND THE DRAWINGS IN THE ENGINEERING ORDER DIDN'T HAVE ANY COMPONENTS; IE; VALVES; DUCTS; HYD LINES; ELECTRICAL HARNESSES; PULLEYS; CABLES; ETC. SOME OF THE HARDWARE INSTALLATION COULD NOT BE INSTALLED BECAUSE COMPONENTS WERE IN THE WAY AND/OR HYD LINES WERE SIMPLY NOT THERE. ALSO; TO COMPLICATE MATTERS; THE NUMBERING OF LONGERONS IN THE ENGINEERING ORDER DID NOT COINCIDE WITH THE ACFT. I CONSULTED MY LEAD; THEN THE ENGINEER IN CHARGE. TOGETHER WE WORKED OUT A SOLUTION; WHICH MAINLY CONSISTED OF RENUMBERING THE LONGERONS IN THE ENGINEERING ORDER. I AM CONCERNED BECAUSE I COULD HAVE INSTALLED THE DRAIN LINE PER THE FIRST ENGINEERING ORDER. HOWEVER; I DON'T THINK THE CLAMPS WOULD BE IN THE CALLED OUT POS AND THE WATER FROM THE DRAIN WOULDN'T FLOW PROPERLY. IT'S OBVIOUS THE ENGINEER(S) NEVER LOOKED AT AN ACTUAL ACFT WHEN MAKING DRAWINGS/ENGINEERING ORDER.