PILOT OF A BEECHCRAFT 99 AIRLINER USED FOR SKYDIVING OPERATIONS; INSTALLS AN ALUMINUM PLUG REPAIR TO REPLACE A BROKEN CABIN SIDE WINDOW USING HIS MAINTENANCE CERTIFICATES FOR THE SIGNOFF.

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I WAS THE PIC OF SAID ACFT. WHILE CONDUCTING SKYDIVING OPS; AN INSTRUCTOR BROKE A CABIN SIDE WINDOW WITH HIS ELBOW. I CALLED THE FAA FSDO TO OBTAIN A FERRY PERMIT. SINCE THERE IS NO ONE AVAILABLE AFTER HRS OR ON WKENDS; I WAS NOT ABLE TO OBTAIN ONE. I EVALUATED THE DAMAGE AND DETERMINED THAT THE ACFT COULD BE FERRIED TO MY SHOP FOR A REPAIR. NOT HAVING THE HEART TO SHUT DOWN THE BUSINESS FOR THE WKEND FOR SUCH A MINOR INCIDENT; I MADE A LOGBOOK ENTRY STATING THE ACFT COULD BE FERRIED; SECURED THE DAMAGED WINDOW AND FERRIED THE ACFT TO MY SHOP. I DID NOT HAVE A REPLACEMENT WINDOW IN STOCK; SO I DEVISED A REPAIR BY CUTTING OUT THE 2 VERTICAL INSIDE RETAINERS AND REMOVED THE BROKEN WINDOW. I THEN FABRICATED A WINDOW PLUG OUT OF 2024 T3 ALUMINUM AND RIVETED IT INTO PLACE. THIS REPAIR WAS STRONGER THAN ANY OF THE PLASTIC WINDOWS AND DID NOT PRESENT ANY SAFETY HAZARDS TO THE PUBLIC. I COMPLETED THE FLYING SCHEDULED FOR THAT WKEND WITH THE PLUG IN PLACE. THE FOLLOWING MONDAY I ORDERED A NEW WINDOW AND REPLACED IT. IT WAS MY DECISION TO INSTALL THIS PLUG IN THE WINDOW AND OPERATE THE AIRPLANE RATHER THAN TO SHUT THE BUSINESS DOWN FOR THE WKEND. THE FACTORS IN MY DECISION MAKING WERE THAT I KNEW I COULD REPAIR THE WINDOW (TEMPORARILY) WITHOUT PUTTING MYSELF OR ANYONE ELSE AT RISK. THIS REPAIR WAS STRONGER THAN ANY SIDE WINDOW INSTALLED IN THE ACFT. CALL IT A BAD JUDGEMENT ON MY PART. I DID NOT ENDANGER ANYONE BY MY ACTIONS AND I REPAIRED THE AIRPLANE THE FOLLOWING WK. SUPPLEMENTAL INFO FROM ACN 809487: I WAS FACED WITH THE DECISION OF SHUTTING DOWN THE BUSINESS FOR THE WKEND AND WAITING TO OBTAIN A FERRY PERMIT OR SECURE THE WINDOW AND FERRY IT TO THE SHOP FOR A REPAIR. I CHOSE TO FERRY THE ACFT TO THE SHOP FOR A REPAIR. MY CALL WAS RETURNED BY THE FSDO. THE INSPECTOR TOLD ME THAT HE 'APPRECIATED' MY ATTEMPT TO OBTAIN A FERRY PERMIT; BUT I SHOULD HAVE CLOSED THE BUSINESS DOWN FOR THE WKEND IN ORDER TO OBTAIN A FERRY PERMIT IN A FEW DAYS. I ATTEMPTED TO UTILIZE THE FAA IN THIS CASE AND WHEN I NEEDED THEM; THEY WERE NOT THERE. THERE NEEDS TO BE A 'DUTY INSPECTOR' AVAILABLE AFTER HRS AND ON WKENDS SO OPERATORS DO NOT HAVE TO SHUT DOWN BUSINESSES. CALLBACK CONVERSATION WITH RPTR ACN 809486 REVEALED THE FOLLOWING INFO: REPORTER STATED THE 2024-T3 ALUMINUM WAS 032 THOUSANDTHS THICK AND STRUCTURALLY STRONGER THAN THE WINDOW THAT WAS BROKEN ON THE BEECH-99 AIRLINER. HIS FLIGHT VISIBILITY WAS NOT AFFECTED.