H ) ▁and ▁Material ▁Supp ly ▁Program ▁( MS P ) ▁support , ▁w are house ▁and ▁material ▁management , ▁A ircraft - On - Gr ound ▁( A O G ) ▁sp ares ▁and ▁service ▁support , ▁aircraft ▁parts ▁trad ing , ▁aircraft ▁operating ▁le ase ▁and ▁O EM ▁representation . ▁ ▁Sub s idi aries / Div isions ▁ST ▁A eros pace ▁Engineering ▁P te ▁Ltd ▁- ▁provides ▁dep ot ▁level ▁maintenance , ▁aircraft ▁upgrad ing , ▁ref urb ishment , ▁major ▁struct ural ▁repair ▁and ▁life ▁extension ▁program mes ▁for ▁a ▁wide ▁range ▁of ▁military ▁and ▁general ▁av iation ▁aircraft ▁including ▁hel ic op ters . ▁they ▁also ▁provide ▁extensive ▁base ▁and ▁line ▁maintenance ▁services ▁for ▁commercial ▁aircraft ▁such ▁as ▁the ▁B 7 3 7 ▁and ▁A 3 2 0 . ▁ST ▁A eros pace ▁Services ▁Co ▁P te ▁Ltd ▁( S AS CO ) ▁- ▁oper ates ▁from ▁Singapore ' s ▁Ch ang i ▁and ▁P aya ▁Leb ar ▁air ports , ▁special ises ▁in ▁air frame ▁heavy ▁maintenance ▁and ▁modification ▁for ▁wide - body ▁aircraft , ▁including ▁B 7 4 7 ▁Section ▁ 4 1 ▁modification , ▁Pass enger - to - Fre ighter ▁( PT F ) ▁conversion ▁and ▁fleet ▁standard isation ▁V T ▁A eros pace ▁Mobile ▁- ▁located ▁at ▁the ▁Brook ley ▁Aer ople x ▁in ▁Mobile , ▁Alabama , ▁United ▁States , ▁they ▁special ise ▁in ▁aircraft ▁heavy ▁maintenance ▁and ▁repair ▁of ▁narrow - body ▁and ▁wide - body ▁aircraft . ▁They ▁are ▁also