



National Aeronautics and Space Administration

Editorial Note: This is a transcript of the Challenger operational recorder voice tape. It reveals the comments of Commander Francis R.Scobee, Pilot Michael J. Smith, Mission Specialist 1 Ellison S. Onizuka, and Mission Specialist 2 Judith A. Resnik for the period of T-2:05 prior to launch through approximately T+73 seconds when loss of all data occurred. The operational recorder was automatically activated at T-2:05 and normally runs throughout the mission. During the period of the prelaunch and the launch phase covered by the voice tape, Mission Specialist 3 Ronald E. McNair, Payload Specialist 1 S. Christa McAuliffe, and Payload Specialist 2 Gregory B. Jarvis were seated in the middeck and could monitor all voice activity but did not make any voice reports or comments. This transcript was released following the accident on January 28, 1986. A copy of the document is also available in the NASA Historical Reference Collection, History Office, NASA Headquarters, Washington, DC.

TRANSCRIPT OF THE CHALLENGER CREW COMMENTS FROM THE OPERATIONAL RECORDER

CDR..........Scobee

PLT..........Smith

MS 1.........Onizuka

MS 2.........Resnik

(The references to "NASA" indicate explanatory references NASA provided to the Presidential Commission.)

Time Crew Crew

(Min:Sec).........Position Comment

T-2:05............MS 2..... Would you give that back to me?

T-2:03............MS 2..... Security blanket.

T-2:02............MS 2..... Hmm.

T-1:58............CDR..... Two minutes downstairs; you gotta watch running down there?

(NASA: Two minutes till launch.)

T-1:47............PLT..... OK there goes the lox arm.

(NASA: Liquid oxygen supply arm to ET.)

T-1:46............CDR..... Goes the beanie cap.

(NASA: Liquid oxygen vent cap.)

T-1:44............MS 1..... Doesn't it go the other way?

T-1:42............ Laughter.

T-1:39............MS 1..... Now I see it; I see it.

T-1:39............PLT..... God I hope not Ellison.

T-1:38............MS 1..... I couldn't see it moving; it was behind the center screen.

(NASA: Obstructed view of liquid oxygen supply arm.)

T-1:33. .........MS 2..... Got your harnesses locked?

(NASA: Seat restraints.)

T-1:29............PLT..... What for?

T-1:28............CDR..... I won't lock mine; I might have to reach something.

T-1:24............PLT..... Ooh kaaaay.

T-1:04............MS 1..... Dick's thinking of somebody there.

T-1:03............CDR..... Unhuh.

T-59..............CDR..... One minute downstairs.

(NASA: One minute till launch.)

T-52..............MS 2..... Cabin Pressure is probably going to give us an alarm.

(NASA: Caution and warning alarm. Routine occurrence during prelaunch).

T-50..............CDR..... OK.

T-47..............CDR..... OK there.

T-43..............PLT..... Alarm looks good.

(NASA: Cabin pressure is acceptable.)

T-42..............CDR..... OK.

T-40..............PLT..... Ullage pressures are up.

(NASA: External tank ullage pressure.)

T-34..............PLT..... Right engine helium tank is just a little bit low.

(NASA: SSME supply helium pressure.)

T-32..............CDR..... It was yesterday, too.

T-31..............PLT..... OK.

T-30..............CDR..... Thirty seconds down there.

(NASA: 30 seconds till launch.)

T-25............PLT..... Remember the red button when you make a roll call.

(NASA: Precautionary reminder for communications configuration.)

T-23............CDR..... I won't do that; thanks a lot.

T-15..............CDR..... Fifteen.

(NASA: 15 seconds till launch.)

T-6...............CDR..... There they go guys.

(NASA: SSME Ignition.)

MS 2..... All right.

CDR..... Three at a hundred.

(NASA: SSME thrust level at 100% for all 3 engines.)

T+O...............MS 2..... Aaall riiight.

T+1...............PLT..... Here we go.

(NASA: Vehicle motion.)

T+7...............CDR.............Houston, Challenger roll program.

(NASA: Initiation of vehicle roll program.)

T+11..............PLT..... Go you Mother.

T+14..............MS 1..... LVLH.

(NASA: Reminder for cockpit switch configuration change. Local vertical/local horizontal).

T+15..............MS 2..... (Expletive) hot.

T+16..............CDR..... Ooohh-kaaay.

T+19..............PLT..... Looks like we've got a lotta wind here today.

T+20..............CDR..... Yeah.

T+22..............CDR..... It's a little hard to see out my window here.

T+28..............PLT..... There's ten thousand feet and Mach point five.

(NASA: Altitude and velocity report.)

T+30............ Garble.

T+35..............CDR..... Point nine.

(NASA: Velocity report, 0.9 Mach).

T+40..............PLT..... There's Mach one.

(NASA: Velocity report, 1.0 Mach).

T+41..............CDR..... Going through nineteen thousand.

(NASA: Altitude report, 19,000 ft.)

T+43..............CDR..... OK we're throttling down.

(NASA: Normal SSME thrust reduction during maximum dynamic pressure region.)

T+57..............CDR..... Throttling up.

(NASA: Throttle up to 104% after maximum dynamic pressure.)

T+58..............PLT..... Throttle up.

T+59..............CDR..... Roger.

T+60..............PLT..... Feel that mother go.

T+60............ Woooohoooo.

T+1:02............PLT..... Thirty-five thousand going through one point five

(NASA: Altitude and velocity report, 35,000 ft., 1.5 Mach).

T+1:05............CDR..... Reading four eighty six on mine.

(NASA: Routine airspeed indicator check.)

T+1:07............PLT..... Yep, that's what I've got, too.

T+1:10............CDR..... Roger, go at throttle up.

(NASA: SSME at 104 percent.)

T+1:13............PLT..... Uhoh.

T+1:13.......................LOSS OF ALL DATA.