Howdy Terry, You had me curious to see what your were speaking of so......I went on a mission lol. I first went to google images and searched for trumpeter Me-262. I knew that I would not be able to see a photo containing the stripes in the small thumbnails they offer there, but i also knew that I could look for aftermarket decals for the bird. Well, I found it I believe 
take a look below and see if the bird in question is one of these: 
Now i saved this image to my computer and using my photo editing program "blew it up" as best as I could until the image blurred. the bottom aircraft with the "purple" writing above it says: 1st line"Me-262A-1a 2nd line (something i cant make out) then Lt. Fritz Muller 3rd line "Prague spring 1945" 4th line & 5th lines "Currently restored and on display at the US national air and space museum" So i went in search of this "fritz Muller" and found out he was one of 40 aces in the me-262, he had 6 kills, and a wartime total of 22 kills and flew with unit JG7. Now all of that meant absolutely nothing to me, I was no closer to knowing what the bars were on the aircraft than I was when I read your question. So, I figured it must be part of a group or unit marking so i looked up "German me-262 unit jg7 and found out this: "JG7. Due to chaotic situation at the end of the war it is hard to be exact, but its is believed that JG7 scored nearly 500 victories, JV44 about 50 and the NJG10/11 48 victories. Ref: Bernd Barbas, "Planes of the Luftwaffe Fighter Aces" claims that JG7 had 'close to 500 victories', JV44 'only about 50'. Jeffrey Ethell & Alfred Price, "World War II Fighting Jets". The Me262 in the fighter role 'caused the destruction of no more than 150 allied aircraft'. Osprey Aviation, "Aircraft of the Aces, German Jet Aces of World War II", lists 28 Aces (5 or more victories) with more than 228 victories for the Me262. William Green, "Warplanes of the Third Reich: states that JG7 'was to claim no fewer than 427 kills' and JV44 'some 50 kills'."
Again, this still doesnt answer your question...but, every photo i looked at of a Me-262 flown by unit JG-7 had the "bars" on them so I am guessing it was a unit marking of some sort, like the old photo below: 
(aboce: this photo with others of Me-262 variants can be found here:
Variants: Me 262A-1a note on the page the different units, but only the JG-7 aircraft have the "bars").
So, unless Barry chimes in and lets us both know what they were for, I am gonna stick with "unit markings" ....and yeah, thats my final answer.....no lifelines used 
Have a good day, Greg ps: note also above on the "decal" sheet, you can just make out on each of those aircraft the unit JG-7 on each, none of the other decals i saw had the bars