Thorny
Topic Author
Posts: 1508
Joined: Thu Jul 07, 2005 8:44 am

Space Shuttle Launch Delays

Wed Aug 30, 2006 10:01 am

As Alessandro requested, here is a summary of all Space Shuttle launch delays to date.

STS-1 Launch delayed 48 hrs (computer synch failure at T-20 min, 4/10/81)
STS-2 Launch delayed 8 days (APU failure at T-31 secs, 11/4/81)
- Launch delayed 3 hrs (multiplexor/demultiplexor malfunction)
STS-3 Launch delayed 1 hr (ground support equipment malfunction)
STS-4 On Time, 6/27/82
STS-5 On Time, 11/11/82
STS-6 On Time, 4/4/83 (~2 mos delay due to SSME leaks during FRF)
STS-7 On Time, 6/18/83
STS-8 Launch delayed 17 mins (weather, 8/30/83)
STS-9 On Time, 11/30/83 (resched from 9/84 for SRB nozzle repair)
STS-41B On Time, 2/3/84
STS-41C On Time, 4/6/84
STS-41D Launch delayed 24 hrs (Backup computer failure, 6/25/84)
- Launch delayed 65 days (SSME failure at T-4 secs, 6/26/84)
- Launch delayed 7 mins (aircraft in launch danger area, 8/30/84)
STS-41G On Time, 10/5/84
STS-51A Launch delayed 24 hrs (weather, 11/7/84)
STS-51C Launch delayed 24 hrs (weather, 1/23/85)
STS-51D Launch delayed 55 mins (vessel in launch danger area, 4/12/85)
STS-51B Launch delayed 2 mins (launch processing system malfunction, 4/29/85)
STS-51G On Time, 6/17/85
STS-51F Launch delayed 17 days (SSME failure at T-3 secs, 7/12/85)
- Launch delayed 1 hr, 37 mins (comm malfunction, 7/29/85)
STS-51I Launch delayed 24 hrs (weather, 8/24/85)
- Launch delayed 48 hrs (computer failure, 8/25/85)
- Launch delayed 3 mins (weather/vessel in launch danger area, 8/27/85)
STS-51J Launch delayed 22 mins (false sensor reading, 10/3/85)
STS-61A On Time, 10/30/85
STS-61B On Time, 11/26/85
STS-61C Launch delayed 24 hrs (aft compartment work, 12/18/85)
- Launch delayed 18 days (SRB HPU failure at T-14 secs, 12/19/85)
- Launch delayed 24 hrs (accidental ET LOX dump, 1/6/86)
- Launch delayed 48 hrs (weather at abort landing sites, 1/7/86)
- Launch delayed 24 hrs (LOX sensor failure, 1/9/86)
- Launch delayed 48 hrs (weather, 1/10/86)
STS-51L Launch delayed 24 hrs (weather at abort landing sites, 1/24/86)
- Launch delayed 48 hrs (forecast weather/launch team rest, 1/25/86)
- Launch delayed 24 hrs (hatch malfunction/weather, 1/27/86)
- Launch delayed 2 hrs (weather)
STS-26 Launch delayed 1 hr, 38 mins (suit malfunction/weather, 9/29/88)
STS-27 Launch delayed 24 hrs (weather, 12/1/88)
- Launch delayed classified period < 24 hrs (weather, 12/2/88)
STS-29 Launch delayed 1 hr, 50 mins (weather, 3/13/89)
STS-30 Launch delayed 6 days (master events controller malfunction, 4/28/89)
- Launch delayed 1 hr (weather, 5/4/89)
STS-28 Launch delayed classified period < 24 hrs (computer error, 8/8/89
STS-34 Launch delayed 5 days (Main Engine Controller failure, 10/12/89)
- Launch delayed 24 hrs (weather, 10/17/89)
STS-33 Launch delayed 48 hrs (SRB avionics malfunction, 11/20/89)
STS-32 Launch delayed 24 hrs (weather, 1/8/90)
STS-36 Launch delayed 72 hrs (crew illness, 2/22/90)
- Launch delayed 24 hrs (range safety malfunction, 2/25/90)
Launch delayed 48 hrs (weather, 2/26/90)
STS-31 Launch delayed 14 days (APU failure at T-4 mins, 4/10/90)
- Launch delayed 3 mins (ground support equipment at T-31 secs, 4/24/90)
STS-41 Launch delayed 11 mins (weather/false sensor reading, 10/6/90)
STS-38 Launch delayed classified period < 24 hrs (classified, 11/15/90)
STS-35 Launch delayed 7 mos (hydrogen leak, 5/30/90)
- Launch delayed 21 mins (weather, 12/2/90)
STS-37 Launch delayed 4 mins (weather, 4/5/91)
STS-39 Launch delayed 5 days (main engine sensor failure, 4/23/91)
- Launch delayed 32 mins (data recorder malfunction, 4/28/91)
STS-40 Launch delayed 8 days (main engine sensor replacement, 5/22/91)
- Launch delayed 4 days (IMU failure, 6/1/91)
STS-43 Launch delayed 7 days (main engine controller, 7/24/91)
- Launch delayed 24 hrs (weather, 8/1/91)
STS-48 Launch delayed 14 mins (communications malfunction, 9/12/91)
STS-44 Launch delayed 5 days (payload malfunction, 11/19/91)
- Launch delayed 13 mins (collision avoidance, 11/24/91)
STS-42 Launch delayed 1 hr (weather, 1/22/92)
STS-45 Launch delayed 24 hrs (hydrogen detected in aft compartment, 3/23/92)
STS-49 Launch delayed 34 mins (weather at abort landing site, 5/7/92)
STS-50 Launch delayed 5 mins (weather, 6/25/92)
STS-46 Launch delayed 48 secs (APU slow response at T-5 mins, 7/31/92)
STS-47 On Time, 9/12/92
STS-52 Launch delayed 1 hr, 53 mins (weather, 10/22/92)
STS-53 Launch delayed 1 hr, 25 mins (ice on ET, 12/2/92)
STS-54 Launch delayed 7 mins (weather, 1/13/93)
STS-56 Launch delayed 48 hours (false sensor reading, 4/6/93)
STS-55 Launch delayed 33 days (main engine failure at T-3 secs, 3/22/93)
- Launch delayed 48 hrs (IMU failure, 4/24/93)
STS-57 On Time, 6/21/93
STS-51 Launch delayed 7 days (premature ordinance charging, 7/17/93)
- Launch delayed 19 days (SRB HPU failure, 7/24/93)
- Launch delayed 28 days (main engine failure at T-3 secs, 8/12/93)
- Launch delayed 48 hrs (payload health check, 9/10/93)
STS-58 Launch delayed 10 secs (aircraft in launch danger area, 10/18/93)
STS-61 Launch delayed 24 hrs (weather/vessel in launch danger area, 12/1/93)
STS-60 On Time, 2/3/94
STS-62 Launch delayed 24 hrs (weather, 3/1/94)
STS-59 Launch delayed 24 hrs (weather, 4/8/94)
STS-65 On Time, 7/8/94
STS-64 Launch delayed 1 hr, 50 mins (weather, 9/9/94)
STS-68 Launch delayed 43 days (main engine failure at T-1.9 secs, 8/18/94)
STS-66 Launch delayed 4 mins (weather at abort landing sites, 11/3/94)
STS-63 Launch delayed 24 hrs (IMU failure, 2/2/95)
STS-67 Launch delayed 1 min (Flash Evaporator System anomaly, 3/2/95)
STS-71 Launch delayed 24 hrs (weather, 6/23/95)
- Launch delayed 72 hrs (weather/forecast weather, 6/24/95)
STS-70 Launch delayed 1 min (communications malfunction, 7/13/95)
STS-69 Launch delayed 8 days (Fuel Cell failure, 8/31/95)
STS-73 Launch delayed 7 days (hydrogen leak, 9/28/95)
- Launch delayed 24 hrs (weather, 10/5/95)
- Launch delayed 24 hrs (test hydraulic levels, 10/6/95)
- Launch delayed 8 days (master events controller malfunction at T-9 mins, 10/7/95)
Launch delayed 5 days (weather/range schedule, 10/15/95)
STS-74 Launch delayed 24 hrs (weather at abort landing sites, 11/11/95)
STS-72 Launch delayed 22 mins (communications malfunction, 1/11/96)
STS-75 On Time, 2/22/96
STS-76 On Time, 3/22/96
STS-77 On Time, 5/19/96
STS-78 On Time, 6/20/96
STS-79 On Time, 9/16/96
STS-80 Launch delayed 2 mins (hydrogen in aft compartment, 11/19/96)
STS-81 On Time, 1/12/97
STS-82 On Time, 2/11/97
STS-83 Launch delayed 20 mins (cabin leak check, 4/4/97)
STS-84 On Time, 5/15/97
STS-94 On Time, 7/1/97
STS-85 On Time, 8/7/97
STS-86 On Time, 9/25/97
STS-87 On Time, 11/19/97
STS-89 On Time, 1/22/98
STS-90 Delayed 24 hrs (communications malfunction, 4/16/98)
STS-91 On Time, 6/2/98
STS-95 Launch delayed 10 mins (aircraft in launch danger area, 10/29/95)
STS-88 Launch delayed 24 hrs (hydraulic malfunction at T-4 mins, 12/2/98)
- Launch delayed 24 hrs (weather, 12/3/98)
STS-96 On Time, 5/27/99
STS-93 Launch delayed 2 days (false sensor reading, 7/20/99)
- Launch delayed 24 hrs (weather)
STS-103 Launch delayed 24 hrs (quality control inspection, 12/16/99)
- Launch delayed 2 days (weather, 12/17/99)
STS-99 Launch delayed 14 mins (cabin leak check, 2/11/00)
STS-101 Launch delayed 24 hrs (range conflict, 5/16/00)
- Launch delayed 2 days (range conflict, 5/17/00)
STS-106 On Time, 9/8/00
STS-92 Launch delayed 4 days (ET/Orbiter bolt check, 10/5/00)
- Launch delayed 24 hrs (weather, 10/9/00)
- Launch delayed 24 hrs (foreign object debris, 10/10/00)
STS-97 On Time, 11/30/00
STS-98 Launch delayed 90 secs (circuit board in aft compartment, 2/7/01)
STS-102 On Time, 3/8/01
STS-100 On Time, 4/19/01
STS-104 On Time, 7/12/01
STS-105 Launch delayed 24 hrs (weather, 8/9/01)
STS-108 Launch delayed 24 hrs (weather, 12/4/01)
STS-109 Launch delayed 48 hrs (weather, 2/27/02)
STS-110 Launch delayed 4 days (launch pad hydrogen leak, 4/4/02)
- Launch delayed 4 mins, 30 secs (communications malfunction, 4/8/02)
STS-111 Launch delayed 6 days (weather/nitrogen regulator replacement, 5/30/02)
STS-112 Launch delayed 6 days (Hurricane Lili in Houston, 10/1/02)
STS-113 Launch delayed 12 days (crew compartment leak/robot arm damage, 11/10/02)
- Launch delayed 24 hrs (weather at abort landing sites, 11/22/02)
STS-107 On Time, 1/16/03
STS-114 Launch delayed 13 days (Engine Cutoff sensor malfunction, 7/13/05)
STS-121 Launch delayed 24 hrs (weather, 7/1/06)
- Launch delayed 48 hrs (weather, 7/2/06)
STS-115 Launch delayed 48 hrs (lightning strike at pad, 8/25/06)
- Launch delayed x days (weather, 8/27/06)

For 116 missions, there have been 161 Space Shuttle launch attempts to date. A launch attempt is defined as a scheduled launch after the countdown begins (usually T-43 hours, or 3 days before scheduled liftoff.)

Of the 116 Shuttle launches, 36 were on time (31%)

Of the 124 launch delays, 43 were less than 24 hours (35%)
(79 out of 116 Shuttle launches took place the day it was scheduled, or 68%)

Of the 124 launch delays, 52 were due to weather (42%)

Of the 161 launch attempts, 81 were delayed more than a day (50%)
 
Galaxy5007
Posts: 637
Joined: Fri Sep 16, 2005 12:06 pm

RE: Space Shuttle Launch Delays

Wed Aug 30, 2006 12:53 pm

HA, see people, the C-5 has an awesome relability rate compared to the space shuttle! Go 57%!

Although alot of the launch delays were weather related. Considering how rare they fly the shuttle to the C-5, there is really isn't a comparison, but I figured I'd throw out a joke for a change.
 
Bobster2
Posts: 1523
Joined: Mon Jan 17, 2005 3:04 am

RE: Space Shuttle Launch Delays

Wed Aug 30, 2006 12:56 pm

Quoting Thorny (Thread starter):
STS-28 Launch delayed classified period < 24 hrs (computer error, 8/8/89

You must have bettter sources than William Harwood. He was told that it launched on time.  Smile

http://www.cbsnews.com/network/news/space/launchland.html
"I tell you this, no eternal reward will forgive us now for wasting the dawn." Jim Morrison
 
petertenthije
Posts: 3333
Joined: Tue Jul 10, 2001 10:00 pm

RE: Space Shuttle Launch Delays

Wed Aug 30, 2006 1:41 pm

So, was it a weather delay, or did the astronauts try to bring liquids aboard? Big grin
Attamottamotta!
 
Thorny
Topic Author
Posts: 1508
Joined: Thu Jul 07, 2005 8:44 am

RE: Space Shuttle Launch Delays

Wed Aug 30, 2006 9:53 pm

Quoting Bobster2 (Reply 2):
You must have bettter sources than William Harwood. He was told that it launched on time.

I thought so too, but according to the official NASA Mission Reports, STS-47 was the first on-time launch since STS-61B, so there must have been a slight delay in STS-28. (Its hard to tell, since that was a classified mission.)
 
Thorny
Topic Author
Posts: 1508
Joined: Thu Jul 07, 2005 8:44 am

RE: Space Shuttle Launch Delays

Thu Aug 31, 2006 1:29 am

Quoting Thorny (Reply 4):
Quoting Bobster2 (Reply 2):
You must have bettter sources than William Harwood. He was told that it launched on time.

I thought so too, but according to the official NASA Mission Reports, STS-47 was the first on-time launch since STS-61B, so there must have been a slight delay in STS-28. (Its hard to tell, since that was a classified mission.)

Here is the relevant section of the STS-28 Mission Summary...

"MISSION SUMMARY

The launch countdown was held at the T-9 minute built-in hold longer than planned when the network signal processor (NSP) had a frame synchronization error and a master memory unit (MMU) area 1 read problem occurred during the transition from OPS 9 to OPS 1. After a computer update to retrieve OPS 1 from area 2 of the MMU, a successful transition was made..."

Because STS-28 was a classified mission, with launch time not announced until the end of the T-9 min hold, we don't know the original launch time or how long it was delayed.

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