INSTRUCTOR PLT MAKES OFF ARPT FORCED LNDG AFTER THE ENG LOST SUFFICIENT PWR TO NOT MAKE IT BACK TO THE ARPT. THERE WAS NO ACFT DAMAGE OR PERSONAL INJURIES.

Narrative

HDG BACK TO STINSON FIELD (SSF) AT 2500 FT MSL (APPROX 1800 FT AGL); AFTER A ROUTINE 1 HR TRAINING FLT IN THE LCL PRACTICE AREA; IN A CESSNA 150L; THE ACFT ENG STARTED TO VIBRATE AND LOSE PWR. I TOOK CTL OF THE ACFT FROM THE STUDENT AND PROCEEDED TO FLY TOWARD A LNDG SITE. HAVING COME TO THE REALIZATION WE WOULD NOT BE ABLE TO MAKE IT BACK TO STINSON (AS THERE WAS INADEQUATE PWR TO MAINTAIN ALT); I DECIDED TO MAKE A FORCED LNDG IN A FIELD APPROX 15 NM SE OF SAN ANTONIO. THE LNDG ON THE FIELD WAS UNEVENTFUL - NO DAMAGE TO ACFT; PEOPLE OR PROPERTY. AFTER SECURING THE ACFT ON THE GND AND ANSWERING THE LAW ENFORCEMENT OFFICIAL'S QUESTIONS; WE WERE TOLD TO WAIT AT THE SITE UNTIL THE ARR OF THE FAA INSPECTOR. ONCE THE INSPECTOR FROM THE SAN ANTONIO FSDO ARRIVED; IT WAS DETERMINED THAT THE CAUSE OF PWR LOSS WAS MECHANICAL. UPON THE INSPECTOR'S REQUEST; I PRODUCED THE LOGBOOKS OF THE ACFT WHICH HE PROCEEDED TO CHK. THE INSPECTOR INFORMED ME THAT; IN THE ACFT AIRFRAME LOGBOOK; AND AIRWORTHINESS DIRECTIVE HAD NOT BEEN UPDATED. THE AIRWORTHINESS DIRECTIVE IN QUESTION WAS REGARDING SIDERAILS WHICH HAD NOTHING TO DO WITH THE ENG OR THE FORCED LNDG. WHEN I EXPRESSED UNFAMILIARITY WITH THIS AIRWORTHINESS DIRECTIVE; THE INSPECTOR WENT INTO LENGTH ABOUT THE DISCREPANCY AND THE POSSIBILITY OF GETTING 'A WARNING' IN MY AIRMAN RECORD. AS FAR AS I AM AWARE; IT IS THE MECH'S RESPONSIBILITY TO MAKE AN ENTRY INTO THE ACFT'S LOGBOOKS AND NOT MINE. IS THE FAA EXPECTING EVERY PLT TO KNOW EVERY AIRWORTHINESS DIRECTIVE PERTAINING TO EVERY ACFT HE; OR SHE; FLIES EVERY SINGLE TIME? AS A PLT; I AM AWARE OF THE BASIC MAINT REQUIREMENTS BUT I AM NOT ABLE TO REMAIN INFORMED ABOUT EVERY SINGLE AIRWORTHINESS DIRECTIVE PERTAINING TO EVERY ACFT I FLY. AS PIC; I DETERMINED THE ACFT WAS IN AIRWORTHY CONDITION BY PREFLTING AND INSPECTING DOCUMENTS IN THE ACFT. THE MAINT LOGBOOKS SHOWED THE 100 HRS AND THE ANNUAL INSPECTIONS WERE COMPLIED WITH. IF THE FAA REQUIRES THE PIC TO BE RESPONSIBLE FOR AIRWORTHINESS DIRECTIVES LOGGED IN THE ACFT MAINT LOGBOOKS; THEY SHOULD SPECIFICALLY AND EXPLICITLY INSTRUCT THE AVIATION COMMUNITY. IF THIS IS NOT THE CASE; THE FAA INSPECTORS SHOULD HAVE A CLR GUIDELINE TO FOLLOW INSTEAD OF HAVING THEM COME UP WITH LOOSE INTERPS OF THE REGS.