WHILE PERFORMING AN ENGINEERING CALLOUT IN MD-80 TAIL COMPARTMENT; AN INSPECTOR NOTICES AN ADDITIONAL CLAMP SHOULD BE ADDED TO SUPPORT AN ELECTRICAL WIRE HARNESS NEAR A RUDDER CABLE PULLEY ASSEMBLY.

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SAFETY CONCERN REGARDING ENGINEERING ORDER. WHILE THE MINIMUM CLRNC BTWN THE PULLEY BRACKET AND WIRE HARNESSES EXISTS; CERTAIN CIRCUMSTANCES MAY CAUSE THE HARNESSES TO CONTACT THE PULLEY BRACKET. ENGINEERING NEEDS TO FIGURE OUT A WAY TO ADD A CLAMP TO MAKE SURE THIS DOES NOT EVER HAPPEN. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THE ENGINEERING CALLOUT IS FOR THE AFT SIDE OF FUSELAGE STATION 1338 BULKHEAD. ACCESS TO THE WIRE HARNESSES AND RUDDER CABLE PULLEY AND SUPPORT BRACKET IS FROM THE TAIL COMPARTMENT CATWALK; LOOKING FORWARD AND TO THE RIGHT; THROUGH A PANEL OR 'VAULT' DOOR. THE ENGINEERING ORDER REQUIRES INSPECTION TO VERIFY PROPER CLEARANCE OF THE WIRE HARNESS NEAR THE VERTICAL RUDDER CABLE PULLEY ASSEMBLY. REPORTER STATED HE HAS NOTICED DURING HIS INSPECTION OF VARIOUS MD-80 ACFT; THAT THE ELECTRICAL WIRE HARNESSES TEND TO RELAX; OR DROOP BETWEEN THEIR FIXED HARNESS CLAMPS IN THIS AREA. THERE IS NOTHING IN THE ENGINEERING ORDER THAT ADDRESSES DISTANCE MAXIMUMS BETWEEN EXISTING CLAMPS; ONLY THAT ADEQUATE SPACE EXIST BETWEEN HARNESS AND CABLE. REPORTER ALSO STATED THERE ARE NO STANDARDS THAT EXISTS IN THE WIRING MANUAL FOR CLAMP DISTANCE. HE HAS SUGGESTED TO ENGINEERING THAT AN ADDITIONAL HARNESS CLAMP BE ADDED IN THIS AREA TO PREVENT THE DROOPING OF THE WIRE BUNDLE AND POSSIBLE CONTACT WITH THE RUDDER PULLEY.