M717 From United States of America, joined Dec 2002, 608 posts, RR: 4
Reply 5, posted (11 years 5 months 1 week 3 hours ago) and read 4992 times:
I operated older model Metro IIs that had JATO bottles. What a joke. The bottles had to be changed every so after, their shelf life was time limited. In other words, whether you fired them or not, you had to change them out after a certain period of time. Well, the MX personnel would fire them before they changed them. They would set them off in an empty aircraft (except for one guy in the left seat), with no brakes set and no chocks, just to see how far they would roll across the ramp. Usually, they didn't even budge. Luckily, I never had to rely on these things to keep me airborne. In the Metro, the idea was that in the event of an engine failure on takeoff, the JATO would keep you airborne long enough for you to retract the landing gear, since the aircraft would not fly on one engine with the gear down. What a design, huh??
The later model Metro IIIs with the 1100 shp engines were much better in this regard.
Broke From United States of America, joined Apr 2002, 1322 posts, RR: 3
Reply 6, posted (11 years 5 months 1 week 3 hours ago) and read 4983 times:
4 or 5 DC-9-33's were built for Overseas National Airways (ONA) with 2 rocket bottles mounted in the aft end of each wing fillet fairing below the wings.
They were intended to be used in case of an engine failure during a high altitude hot day take-off.
The wags stated that their intent was to make sure the wreckage ended up off of the airport property.
Most of these airplanes are now flown by ABX Air, but without the rocket bottles. If you know where to look you can see the bulges in the fairings where the bottles used to be installed.
People I know that worked for ONA said that they never heard of them being used for their intended purpose. The rocket bottles had a hard time or a time limit after which they had to dispose of them. Since a fuelled rocket bottle is an extreme case of hazardous material; what ONA would do is a rocket assisted take-off at their Wilmington, Ohio (now operated by ABX Air) base in order to expend the fuel.
I understand that these were great fun to watch and the rocket bottles gave a real kick in the pants to the crew.
Jetguy From , joined Dec 1969, posts, RR:
Reply 7, posted (11 years 5 months 1 week 3 hours ago) and read 4982 times:
It was an option on the old Beech 18s and (I believe) some of the older Queenairs as well. As for the Metroliners, the JATO bottle was supposed to provide the crew enough time to get the get up in the event of an engine failure - the airplane needed it for certification purposes. Scary eh?
Timz From United States of America, joined Sep 1999, 6927 posts, RR: 7
Reply 9, posted (11 years 5 months 1 week ago) and read 4936 times:
Various aircraft have carried rockets for just-in-case-of-emergency-- but dunno of any transport aircraft that have used them routinely. There were pics of DC-4s test-flying out of La Paz (?) with rockets, but even there I've never heard of an airline using rockets for everyday takeoffs.
Musang From United Kingdom, joined Apr 2001, 872 posts, RR: 6
Reply 12, posted (11 years 5 months 6 days 5 hours ago) and read 4787 times:
727s which had the mod were recognisable by the twin strengthening doublers side by side on top of the fuselage, above the wing. They were basically two longitudinal strips, each approx two feet from the crown line. Clearly visible from the ground if you weren't too close, I'd guess each was about 15 feet long, 8 inches wide, less than an inch thick.
The only one I ever saw was with one-time Turkish charter company BHT-Bogazici. (They didn't use the mod though).
IMissPiedmont From United States of America, joined May 2001, 6362 posts, RR: 33
Reply 15, posted (11 years 5 months 5 days 15 hours ago) and read 4705 times:
A book? Well as I've been aboard every Evergreen DC-9, I think that statement may be a bit off base. But then, I was not an APE crawling around in the cockpit (APE being not a derogatory term by the way). I just never saw JATO systems on any of them.
Maybe the wiring and hard points were installed on a few DC-9s, but was never used.
I have pictures of MX 727s with JATOs firing that my grandfather took. A search of the internet this week has revealed not a single example of any other turbine airliner with JATOs.
I'd love to be proven wrong. Please post a link to a picture. Or perhaps, better yet, the appropriate SRM reference to repairs in the JATO structure? I have a few DC-9 SRMs in my library, sadly none are for Evergreen DC-9s.
Again, I'm not doubting you, I'd truly love to see such.