STC SA490NW

'Bnittd .staltll ofarnttira Bepartmrntof'U:ratUlportation-federal a\liationadministration ~upplcmcntal1[~pcQ:crtificatc Jl{;rn~ SA490NW Surrend red ALASKA AIRLINES, INC.

<j//". Civil Air t~Y'~U(I.%~bU.I-,~#t ....,&,./0rN4.Jl~n/.e~: A3WE ,/(1",(,/, Boeing vll,,/,! 727-100/-200 £J(,,"0/(~.n/0~~,!/J,.J:yn'{~~u:y~-: Installation of Radio Corporation of America Primus-90 Weather Radar System in accordance with the FAA sealed Alaska Airlines Master Drawing List No. 6334402230, Revision L or later FAA approved revision.

-./:~II(~'/"(dl.Ju:ou/~""n(;;'4~~n.;': The approval for this change in type design applies basically to the above model aircraft only. This approval should not be extended to the aircraft of this model on which other previously approved modifications are incorporated unless it is determined that the interrelationship between this change and any other previously approved modifications will introduce no adverse effect upon the airworthiness of that aircraft. A copy of this Certificate and Alaska Airlines Master Drawing List No. 6334402230 shall be ~Rinta~~ed as gart of the permanent records f9r the modified aircraft.

./A,,':;'u,,/r,rA'lu, ANUf /.11•••,AHI0{jl'h.'~y/A'hl/;I'.H-h«-h/.iJ</h,/ /v4J{J/'~"'_~V0'N"nfa/MHI//I'NnN';n"~I/.#("IH n~~4u_ 9'.,k"",-,,,,J' January 13, 1978 !/~d"am,I'Id.-~/.' September 18, 1987 .CJJ;y'/'H,/,;>':tf.,?",n,;,~m/':' (Signatur Manager. Seattle Ai ft Certification Office, ANM-100S (Titl, ) A,~}' alteration of this cert{fieate is punishable b)' a fine o/not o.:cud,"ng SI,OOO, or imprisonment not exceeding 3 _reaTs,or both.

This urlificat, rna}' b( transfnr(d in auordmu( ,mill FAR 2/.-17.

FAA Fo••• 8110-2(10-68)