I saw the question about the landing gear on the Enterprise from TOS (Did the Original Enterprise Have Landing Gear?) and it made me wonder: are all (or any) of the Constitution/Galaxy class starships capable of landing? e.g. If they have lost all of their shuttles and the magnetic field around the planet won't allow transportation. I mean some standard procedure, not an extreme landing like it was in ST: Generations.
No, neither the Constitution Class starship, nor the Galaxy Class starship are designed to land, except in extreme circumstances where a landing would be characterised as a catastrophic crash-landing.
Constitution Class Emergency procedures;
The best semi-canon "emergency landing procedures" for the Constitution-class Starship are detailed in "Mr Scott's Guide to the Enterprise".
The implication is that the nacelles are explosively ejected. The ship then extends "Emergency Landing Legs" that will be used stabilise the saucer section on landing. The saucer would either be abandoned, destroyed or taken back into space by another Federation vessel depending on the potential for violating the Prime Directive.
Galaxy Class Emergency Procedures;
These can be found in the canon sourcebook; "The TNG Technical Manual";
Again, the nacelles would be separated (in this case using the "Saucer Separation sequence") and the saucer would then use a mixture of shields and structural fields to prevent its occupants from suffering severe injuries on impact.
This sequence, originally planned for the series but shelved due to the extreme cost was ultimately seen in the film 'Generations';
In the non-canon Trek book "Rogue Saucer", the Enterprise is outfitted with new (experimental) saucer section that can supposedly survive a landing;
Suffice to say, it's unsuccessful.
Not that I've ever heard. Voyager was one of the few if not the only one that had the capability to land.
I've never read that any others could land as they were generally too big and simply never designed to land on a planet. That is why they had the transporters, shuttles, etc.
The Constitution class ships could separate the saucer section from the warp drive as Kirk even mentioned in a original episode. In theory it's possible that the saucer section could possibly land on a planet.. but not while it's in it's normal, all together configuration.
The saucer sections of the Constitution and Galaxy class ships could land, but not the main body. There are a couple of books (one was Enterprise, can't recall the other) where the saucer section of the Enterprise (1701) was detached and landed on the Earth for the purposes of a refit. The reason was described that workers could work much faster in a full gravity environment.
The Galaxy class ships were listed as having the saucer section capable of landing in one of the technical manuals.