The first Type 40s were built on Date Index 1995733 RE, well over five thousand years before the Last Great Time War. Since the Type 40s were some of the last to be constructed with Mark I technology they were, overall, very similar to the Type 39.But, unlike many early models of TARDIS, the interior of the Type 40 took full use of its dimensionally transcendental nature. The total volume of rooms and corridors of a Type 40 TARDIS has been described as being about the size of a small town, and it could take over a year to give a full guided tour. Not everyone saw this large size as a plus, and the major complaint made by several Time Lords against the Type 40 was that its kitchen was always located very far from the Control Room.
Despite the large size, the main drive of a Type 40 produced orthogonal readings with a hyper time shift ratio of only ZS+ 101 EQ. These shift ratios were much smaller then the wave loops generated by later Types of TARDIS. A Type 40 had the capability of boosting its reality quotient to the point where everything near it could be time locked at a quotient of up to 3. Using this, a Type 40 could trap another Type 40 or early models TARDIS by keeping it from dematerializing. But a later model TARDIS would be able to escape, sending the Type 40 spinning off into the Vortex in the process.
Type 40s (and later models) were equipped with a Defence Unit that included Banshee [ttv]Circuits. This defensive warning system could pull images from the data banks and put them on the Scanner to warn the crew about dangerous situations outside. Some operators kept it disconnected because they resented how overly sensitive to threat it is.[/ttv] This system was necessary because (like most capsules before it) the Type 40 was initially released without any Force-Field Generator. Many operators corrected this disadvantage by constructing and installing their own generator, and later refits would make the generator standard on all Type 40s.
Despite the advancements made over the last 10 models, the Type 40's Chameleon Circuit was still considered to be a primitive, early, version by modern standards. To create a new disguise the operator had to use a retractable keypad that extended out of console when a switch under the console was thrown. This keypad allowed new disguises to be created with machine code. Pre-used disguises were automatically accessible. Unlike later capsules, the Type 40 TARDIS made a whooshing noise when its chameleon circuit altered the exo-shell. Like many older models, the Type 40 was particularly prone to system breakdowns of the Chameleon Circuit, which would freeze the exterior appearance. They required regular Chameleon Conversions to combat this tendency. This problem was fixed with the introduction of the Type 65.
But this was not the only fault common in the Type 40. The Type 40 tended to suffer from a fundamental systemic failure that caused numerous little malfunctions. Even with a Force-Field generator installed, the Type 40 was still particularly vulnerable to antimatter implosions. Some Type 40s had intermittent faults in their Attitude Control, resulting in damage and injury from exterior acceleration/gravity disruption. The operator can compensate for this by frequently re-setting the pitch stabilizer's manual control. Like other pre-60 types of this era, the Type 40 often developed faults with its Fluid Links. And some of them had faulty Protocol circuits with unreliable connections. These connections could fail causing the circuits to disengage and allowing the TARDIS to break some of the Laws of Time.
The first Type 40s were built on Date Index 1995733 RE, and by the end of its production run, 305 Type 40 Time Travel Capsules had been grown and registered at the Black Hole shipyards. However, due to the many faults the Type 40 quickly became known as a renegade model and a lemon. By Date Index 309456 (when the Doctor was born) the Type 40 was considered to be a museum piece. By 309715 they were classified as Veteran and Vintage Vehicles, and training in their operation was only offered as an elective at the Time Academy. Over 400 years later the release of the Type 70 spelled the final end for the older design. 304 of the Type 40s were de-registered and made non-operational.
- One of the first models equipped with Molecular Stabilizers for self-repair
- Equipped with a sensitive and pro-active Defence Unit
- Could time lock areas with a reality quotient of up to 3.
- First to have a Remote Control option.
- Main drive produced orthogonal readings with a hyper time shift ratio of only ZS+ 101 EQ.
- Required regular Chameleon Conversions to keep the Camouflage Unit from freezing up
- Some of the last models to be constructed with Mark I technology
- Frequent fluid link failures.
- One of the last to require chameleon disguises to be manually created with machine code.
- One of the last types not to have a force-field generator
- One of the last types to carry the Record of Rassilon
- One of the last models to use Old High Gallifreyan as the programming code for its Artron Mainframe.
- 305 Type 4 TT Capsules were registered during the production run.
The following color code is used:
- Black: For information from the TV Series, including Dimensions in Time, and 1996 TV Movie.
- Blue: For information from the Novels and Audios including Target, Virgin, BCC, and Big Finish.
- Green: For information from 'licensed' reference sources such as the Technical Manual, Doctor Who Magazine, and the Role Playing Games.
- Red: For information from unofficial sources -The Faction Paradox series, behind the scenes interviews, author's speculation, and popular fan belief.
The TARDIS Technical Index is copyright Will B Swift.