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Silver-zinc battery provides 17 volts at 52 W/hr for 7 days, return to Earth. The KENNEDY SPACE ORBITAL OPERATIONS DEORBIT EXTERNAL TANK DISPOSAL 2 222 PROBLEM INCLINATIONS 2 Clee Ф І 142 N. MI. 8 z (263 km) ALLOWABLE LAUNCH AZIMUTH 2 ж” 77074 EXTERNAL TANK SEPARATION BOOSTER SPLASHDOWN RETURN TO LAUNCH SITE LAUNCH CENTER Figure 1-4.— A Space Shuttle External Tank by pin.