A B737-500 FLT CREW ASSIGNED TO AN ACFT THAT HAD PREVIOUSLY RETURNED TO GATE FOR 'POP' NOISE AFTER A CO-PILOT'S EYEBROW WINDOW CHANGE BY CONTRACT MAINT; ALSO EXPERIENCED THE SAME 'POP' NOISE AT APPROX 3000 FT. SPEED TAPE LIFTED.

Narrative

REASSIGNED TO FLY ACFT X. ACFT HAD RETURNED TO ZZZ AFTER ITS PREVIOUS TKOF BECAUSE OF A 'POP' HEARD AFTER TKOF. THE COPLT'S EYEBROW WINDOW WAS REPLACED BY A CONTRACT MECH THE NIGHT BEFORE IN ZZZ AND THE PREVIOUS CREW HEARD A POP AND AIR NOISE; AND ELECTED TO RETURN TO ZZZ. WHEN WE WERE ASSIGNED THE ACFT; I SPOKE TO MAINT CTL IN ORDER TO DETERMINE THE MAINT STATUS OF THE ACFT. HE EXPLAINED THE PREVIOUS CREW'S RETURN AND THE SUBSEQUENT FINDINGS THAT THE SPEED TAPE APPLIED OVER THE FRESH SEALANT HAD DEPARTED THE ACFT AND THAT MOST LIKELY; THAT WAS THE SOURCE OF THE POP SOUND. HE RELAYED THAT THE ZZZ CONTRACT MECH HAD AGAIN RE-TORQUED ALL OF THE WINDSHIELD BOLTS AND AGAIN RE-TAPED OVER THE SEALANT WITH SPD TAPE. HE AND I AND THE COPLT AGREED THAT THE ACFT WAS AIRWORTHY FOR THE FLT. AT APPROX 3000 FT ON CLBOUT OF ZZZ; WE TOO HEARD A 'POP' AND WATCHED THE SPD TAPE PEEL UP; HIT THE FUSELAGE ABOVE THE WINDOW; AND AGAIN DEPART THE ACFT. THERE WERE NO PRESSURIZATION ISSUES; THE WINDOW WAS SECURE; THERE WAS NO AIR NOISE OR LEAK APPARENT. WE ASKED FOR AN INTERMEDIATE ALT LEVELOFF AND THE COPLT ASSUMED THE FLYING AND COM DUTIES. I IMMEDIATELY INITIATED A PHONE PATCH WITH MAINT CTL AND DISPATCH AND WE ASCERTAINED THAT THE WINDOW WAS SECURE; THERE WAS NO PRESSURE LEAK; AND THAT SIMPLY THE SPEED TAPE HAD (AGAIN) DEPARTED THE ACFT. IT WAS ALSO DECIDED THAT IT WAS SAFE TO CONTINUE AND THAT THERE WAS NO MECHANICAL NEED TO RETURN TO ZZZ. WE CONTINUED UNEVENTFULLY. A CONCERN IS THE EFFICACY OF THE REPAIR THE CONTRACT MECH IN ZZZ MADE; WHICH PARTIALLY FAILED 2 TIMES.