Back in my JetStar flying days, I knew a couple of pilots who flew a Lear 36 for a Fortune 100 company who operated a few LearJet 36’s because of their transcontinental range. The company often used the Lear’s to fly from the Northeast to the west coast nonstop, they replaced Saberliner 60’s, which had to make a fuel stop enroute with the Lears so they could make the trip nonstop.
The story is true about the odors from the lavatory exiting out through the cockpit, in fact it was the pilots standard procedure that anytime they saw the privacy curtain being closed by a passenger, they immediately went on oxygen, they didn’t bother to wait until it was determined that the passenger took a dump in the toilet because by then it was to late.
The pilots hated flying the LearJet transcontinental and they told me the passengers hated it as well, imagine being confined in a airplane for 5 plus hours in a cabin where the interior height at the highest point is 4.4 feet, they or the passengers could not even stand up in the cabin to stretch their legs during the long flight.
On the LearJet the cabin normally was set up so the 2 rear seats were like bench seats, not separated so you sat shoulder to shoulder to the person next to you. The LearJet fuselage was a perfect circle, not like most corporate jets or airliners where the fuselage walls by the windows is flattened out so there is more room at the shoulders, so at the maximum width of the interior at the widest point midway up the cabin wall is about 5 feet which is near where your elbows are and tapers in from there so the interior space is less at the shoulders. And the total length of the passenger cabin from the bulkhead behind the pilots heat to the bulkhead behind the rear seats is around 13 feet.
Many corporate jets do not have flat cabin floors like airliners, they have a dropped center aisle of about 6 inches, which gives the passengers a little more room for walking hunched over to their seats and on the LearJet this was where the 4.4 feet was measured. The raised space under the passenger seats is where the control cables and the wire bundles are routed.
Corporate jets use club seating for their cabins, unlike airliners where all the seats face forward, so the next set of seats forward from the rear bench seats face aft, and again unlike airliners where there is room under the seats for your feet, the seats go all the way down to the floor because they are articulated, you can swivel the chair and if set up the chair can move inward away from the cabin sidewall. Without this set up you would have to play footsies with the person facing you for foot space. Also there are no tray tables on the back of the seats like airliners, the tray table sits vertical inside the sidewall and lifts up and inward and you share the table with the person facing you and they are called drop tables. Going forward in the cabin there is an additional set of club seats opposite the cabin entryway door and forward of that is the potty.
This is a typical seating arrangement, corporations can tailor their seating configurations to however they want, as long as it is certified and approved. I have seen the cabin set up with the 2 rear bench seats as described, then 4 seats set up in a club seating arrangement with the first 2 seats facing rear and the next 2 seats facing forward and again with the potty opposite the entryway door.
Many small corporate jets have the potty inside the passenger cabin and like the LearJet have the top cover of the potty padded and upholstered and have a backrest and a seat belt and shoulder harness and this is an approved passenger seat. So imagine with the full load of passengers the unfortunate passenger who gets to sit in this seat, probably the lowest ranking passenger. There is no window, you are facing sideways and looking at the cabin entry door, and if any passenger needs to use the potty then you have to switch seats with that passenger, and where does that passenger go sit when one of the pilots have to use the potty, I doubt into the vacated pilots seat so that passenger winds up in the cabin probably sitting on some ones lap. And for privacy all you had was a floor to ceiling curtain that extended from the sidewall inward to the entry door, I don’t remember a sink installed to wash your hands, so I assumed there was a load of wash and dries on board.
I am 6’3” and I tried to get into the pilots seat of a LearJet 35 based at
HPN, my home airport and could not, but the Chief Pilot of this flight dept. was 6’4” and he managed to fit in, he either must have been a contortionist, double jointed or a glutton for punishment.
I guess I was spoiled by the JetStar, it also had a dropped aisle and with this we had 6 feet of headroom and in the galley which was in the rear of the passenger cabin the floor dropped a little bit more and I was able to stand straight up, and behind the galley we had a full private lav 6’3” tall and the full width of the cabin.
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