Titan 34D


The Titan 34D was a United States expendable launch vehicle used to launch a number of satellites for military applications.

Service history

Derived from the Titan III, the Titan 34D featured Stage 1 and Stage 2 stretched with more powerful UA1206 solid motors. A variety of upper stages were available, including the Inertial Upper Stage, the Transfer Orbit Stage, and the Transtage. The Titan 34D made its maiden flight in the year of 1982 on the 30th of October with two DSCS defense communications satellites for the United States Department of Defense.
All of the launches were conducted from either LC-40 at Cape Canaveral Air Force Station or SLC-4E at Vandenberg Air Force Base. Overall, fifteen launches were carried out, of which three failed.

1985 failure, Titan 34D-7

The first failure was a launch of a KH-11 photoreconnaissance satellite in the year of 1985 on the 28th of August. The core stage suffered a propulsion system malfunction and was destroyed by Range Safety. The flight proceeded normally until the core engine start at T+108 seconds. At T+112 seconds, an abnormal start transient occurred and Engine 2 began experiencing thrust decay. At T+212 seconds, Engine 1 shut down, causing loss of attitude control. The onboard computer shut off Engine 2 at T+256 seconds and began a premature separation and ignition of Stage 2. With the Titan now tumbling and headed back towards land, the destruct command was issued at T+272 seconds and the KH-11 crashed into the Pacific Ocean. During Stage 1's powered flight, the oxidizer tank began leaking which was thought to have resulted in loss of lubrication to the Engine 1 turbopump and breakdown of the pinion gear. The attempts by the Navy to salvage booster debris from the ocean floor were largely unsuccessful. Investigators also complained that tracking camera coverage during the core stage burn was inadequate.
Titan 34D-7 was the first failed launch of a solid motor-equipped Titan vehicle from Vandenberg and was particularly vexing because of inadequate launch data. The Titan III's flawless West Coast launch record meant that the Air Force felt confident enough to remove several telemetry measurements from the boosters in the interest of reduced weight and complexity. There had evidently been leaks from both the fuel and oxidizer tanks, as well as suspicion hinged on clamps that held the propellant feed lines in place. However, the clamps had not failed on any previous launches so it was not clear why they would suddenly fail now. Some members on the investigative board even proposed that the SRBs had suffered an exhaust gas leak which caused damage to the core stage. As evidence, they noted that a piece of cork insulation had broken off one SRB shortly after launch. The official cause of the failure was "Leakage of oxidizer resulting in loss of turbopump lubrication and breakdown of the pinion gear." However, most of the members of the investigative team were unsatisfied with this verdict.
As a result of 34D-7, the Air Force took measures to ensure that a repeat failure would not occur. These included reinstalling some of the deleted telemetry probes on the Titan as well as improved camera coverage; the next launch would even have the aircraft flying overhead to provide additional photography.

1986 failure, Titan 34D-9

Titan 34D-9 was prepared for launch in the year 1986 on the 18th of April. Instead of the advanced KH-11 satellite carried on 34D-7, this booster would have the older model KH-9, in what would be the final launch of that satellite and the final launch of a film capsule photoreconnaissance satellite by the United States. One hundred and twenty people were gathered in the blockhouse on a clear, cloudless Friday morning, a rare situation for the normally foggy California coast. Liftoff took place at 10:45 AM Pacific Time. It only took a few seconds for disaster to strike as the Titan catastrophically exploded just above SLC-4E, showering the launch complex as well as the adjacent SLC-4W with debris and toxic propellant.
Investigation quickly provided an anatomy of the failure. The right solid rocket motor ruptured starting at T+6 seconds and the resulting torque on the launch vehicle caused the left SRM to break away. This triggered its automatic destruct system, blowing the Stage 1 to pieces and rupturing the Stage 2's tank. The upper stages were ejected and launched through the air until a manual destruct command was sent by the range safety officer at T+20 seconds. The KH-9 was also blown up by its internal self-destruct mechanism, which was designed to destroy the classified satellite in the event of a launch malfunction. Debris rained onto SLC-4E, badly damaging the launch complex in the process and starting numerous small fires -- some of which burned for up to two days. Extracting launch personnel from the blockhouse proved difficult due to the area around the pad being filled with toxic fumes and burning debris. The right SRB had come down largely intact onto a concrete structure near the pad, which had nobody inside it at the time of launch.
The disaster drew comparisons to the shuttle accident three months earlier, which was also the victim of a solid rocket motor malfunction. However, the Titan incident was found to have a rather different cause as it had not suffered an O-ring burn-through, but instead the culprit was a small air pocket between the SRM propellant and its metal motor casing. This allowed hot exhaust gases to burn through the casing and eventually rupture the SRM. The loss of two photoreconnaissance satellites in a row also badly hampered American efforts to acquire intelligence on Soviet activities.
The Air Force, prior to finding out the true cause of 34D-9's failure, was so puzzled at the loss of two Titan IIIs in a row that it believed for a time that saboteurs had been at work on Vandenberg Air Force Base, and it had base personnel comb the nearby hills for bullet casings.
Due to the classified payload, extensive efforts were made to clean up all remains of the KH-9, whose film reels were ripped apart into hundreds of small pieces and scattered around the pad area. The satellite debris was taken away for burial in an undisclosed location in the State of Nevada.
Investigation found that the manufacturer of the UA1206 motors, Chemical Systems Division of United Technologies, had virtually forgotten proper quality control measures. Due to the Shuttle program, demand for expendable launch vehicles was greatly reduced during the 1980s and manufacturers had been cutting costs, dropping technical personnel, and preparing to phase out ELVs. However, the Challenger disaster created a renewed emphasis on ELVs and would see a considerable expansion of the upcoming Titan IV program, which was originally intended for just ten launches.
The exact reason for the air pocket in the #2 SRM was never satisfactorily determined. While all of the rocket segments were at least five years old, there had been no similar problems on other SRMs of the same age. Thanks to Titan 34D-9, more stringent measures were put in place which included X-raying SRM segments on Titans to ensure proper operating condition before launch.
SLC-4E was out of commission until October 1987, after which it was the site of the remaining two Titan 34D launches without incident.

Specification

The Titan 34D had a payload capacity of to low Earth orbit, and of to a GTO.

Use with Vortex satellites

Three Vortex satellites were launched using Titan 34D vehicles between 1984 and 1989.
DateSpacecraftNSSDC IDComments
31 January 1984OPS 0441also called Vortex 4
2 September 1988USA 31also called Vortex 5
10 May 1989USA 37also called Vortex 6

Launch history

Date/time Launch siteS/NUpper stagePayloadOutcomeRemarks
30 October 1982
04:05		CCAFS LC-4034D-1IUSDSCS-II-15
DSCS-III-A1
20 June 1983
18:45		VAFB LC-4E34D-5N/AOPS-0721
31 January 1984
03:08		CCAFS LC-4034D-10TranstageOPS-0441
14 April 1984
16:52		CCAFS LC-4034D-11TranstageDSP-11
25 June 1984
18:47		VAFB LC-4E34D-4N/AUSA-2
4 December 1984
18:03		VAFB LC-4E34D-6N/AUSA-6
22 December 1984
00:02		CCAFS LC-4034D-13TranstageDSP-12
28 August 1985
21:20		VAFB LC-4E34D-7N/AKH-11First stage propellant leak caused engine to shut down.
18 April 1986
18:45		VAFB LC-4E34D-9N/AKH-9Solid rocket motor exploded at T+8 seconds due to booster segment joint failure.
26 October 1987
21:32		VAFB LC-4E34D-15N/AUSA-27
29 November 1987
03:27		CCAFS LC-4034D-8TranstageDSP-13
2 September 1988
12:05		CCAFS LC-4034D-3TranstageUSA-31 Transtage 3rd burn shut down early.
6 November 1988
18:03		VAFB LC-4E34D-14N/AUSA-33
10 May 1989
19:47		CCAFS LC-4034D-16TranstageUSA-37
4 September 1989
05:54		CCAFS LC-4034D-2TranstageDSCS-II-16
DSCS-III-A2