DC9-15 CREW WAS UNABLE TO RAISE THE LNDG GEAR. THEY ALSO WERE UNABLE TO GET THE ACFT GND SHIFT FROM THE GND TO THE FLT MODE.

Narrative

FOLLOWING NOSE LNDG GEAR TIME CHANGE; ACFT TOOK OFF AND CREW WAS UNABLE TO RETRACT LNDG GEAR; AND HAD PROBS WITH PRESSURIZATION. GOT GEAR TO RETRACT AFTER CONSULTING MAINT CTL AND PUSHING GEAR HANDLE RELEASE BUTTON OUT OF UPLATCH DETENT POS. GEAR THEN CYCLED NORMALLY. ACFT RETURNED TO FIELD OF DEP (MILWAUKEE). GEAR DOWN. NOSE GEAR WAS JUST CHANGED; AND RETRACTION TESTS AND LIGHT INDICATION CHKS FOR GEAR POS WERE PERFORMED; WITH SATISFACTORY RESULTS. ACFT WAS RELEASED FOR SVC PRIOR TO AIR TURN BACK AS DESCRIBED ABOVE. UPON INVESTIGATING THE MATTER WITH ACFT ON JACKS; FOUND NOSE GEAR GND SENSING CABLES AND ANTI-RETRACT CABLE OUT OF PROPER ADJUSTING (RIG) IN TERMS OF TENSION; PER MAINT MANUAL PROCS. THESE CABLES DIRECTLY AFFECTED BY AND ACTUATED BY NOSE GEAR STRUT EXTENSION AND COMPRESSION. PRESSURIZATION OF CABIN AND RETRACT PROBS IN FLT RESULTED. AFTER ADJUSTING CABLE TENSIONS; RETRACTION TESTS PERFORMED AND GEAR HANDLE TRAVEL WAS ALL NORMAL; AS WERE THE LIGHTS. ACFT RELEASED FOR SVC; WITH NO FURTHER PROBS. THE ROOT CAUSE WAS IMPROPER RIG OF GND SENSING CABLES.