The L-1011 cockpit is spacious; it looks more like the bridge of a ship.
For either pilot to depressurize the aircraft the normal way they’d need to
A) Be told by the FAs over the intercom that they can’t get the doors open;
B) Realize pressurization was the problem;
C) Realize the Flight Engineer (“FE”) wasn’t responding;
D) Slide their seat back;
E) Unstrap and stand up, which is always a bit of contortion even in a spacious cockpit;
F) Take a couple steps to reach the FE panel;
G) Find the pressurization section of the FE panel perhaps though dense smoke;
H) Flip the appropriate switches;
I) Hope the power was still on and the control wires weren’t burned through.
It’s likely the hoses for the pilots’ oxygen masks are too short to still have the mask on while reaching back there. The First Officer (“FO”) starts out closer to the FE panel than the Captain does, but probably not enough closer. So a pilot trying to do that would probably have to remove his oxygen mask to get back there. Which may well have been a promptly incapacitating move itself.
Aircraft of that era had separate oxygen masks and smoke googles which resemble snorkeling masks. You’d be hard pressed to remove the oxygen mask without dislodging the smoke goggles. In any significant amount of smoke the instant reaction to smoke in the eyes is that they close and stay closed. Now you’re blind, trying to fumble to find the right knobs / buttons on a wall festooned with them: Lockheed L-1011-385-3 TriStar K1 (500) - UK - Air Force | Aviation Photo #1748812 | Airliners.net
All in all, that would probably be a bridge too far given how close to the end they already were. On a sunny smoke-free day at the gate it’s the work of seconds.
The other way to depressurize is to kill the engines. Which takes just a couple seconds and is easily done from the pilot’s normal seating position. So far so good.
Then wait a few *minutes *as the pressure leaks down through the mostly but not entirely closed pressurization control valves. I’ve heard hangar tales of empty airplanes being inadvertently pressurized. It’s usually a 10+ minute process to get the doors open after the source of air is cut off. And that’s with no fire or panic or incapacitation to contend with.
It’s been years since I read of this accident but I believe the fire department eventually shut down the engines by the expedient of blasting enough water down the intakes to choke out the engines’ fires. Good thing #2 with its more inaccessible intake was already shut down. Once all engines quit running the pressurization eventually dropped away. I don’t know whether the cabin roof burned through first; that’d certainly depressurize things all but instantly. But would also be far, far after the interior conditions were unsurvivable.
The problem with short oxygen hoses still exists. A couple years ago UPS had a 757 or 767 freighter develop a smoky fire in the overhead control panel above and between the pilots. Procedure is both pilots immediately don oxygen mask and smoke goggles, then one pilot keeps flying while the other first fights the fire then deals with the emergency checklist, etc.
Sounds good except the handheld halon fire extinguisher is stored on the back wall of the cockpit and can’t be reached by either pilot while wearing their oxygen mask; the mask hose is too short.
The Captain was the designated firefighter and elected to remove his mask to get the extinguisher and return to his seat. The smoke wasn’t too thick yet, but he still got a lungful of gunk. They landed successfully.
Had their fire been faster growing or gotten bigger before they noticed it the whole scenario could have gone irretrievably pearshaped from the moment the Captain tried to get the extinguisher.
Fire other than in the engines is the one scenario that keeps me up at night. I’m far from alone in that.