ACFT EQUIP PROB. PARTIAL LOSS OF HYD FLUID. FLC PLANNED FOR AND DECLARED EMER; NOT KNOWING IF THERE WOULD BE A PROB WITH LDNG GEAR; FLAPS; ETC. AN UNEVENTFUL LNDG AND TAXI TO THE GATE.

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ON TKOF DURING GEAR RETRACTION; SYS A QTY DECREASED ENOUGH TO TRIGGER SYS A QTY LOW LEVEL LIGHT. GEAR UP AND LOCKED; FLAPS UP; QTY STABILIZED AT 2 GALS. PRIOR TO TKOF SYS A QTY INDICATED JUST UNDER 4 GALS; FULL AT THE GATE. WITH NO FURTHER INDICATION OF A SYS QTY LOSS FLT PROCEEDED ON TO MIA. WE LEVELED OFF AT FL290 DUE TO OPERATING MANUAL RESTRS SHOULD WE LOSE SYS A QTY ALTOGETHER. WE MADE CONTACT WITH DISPATCH AND THROUGH COMMERCIAL RADIO. ALL CONCERNED AGREED IT PRUDENT TO CONTINUE ON TO MIA. ABEAM JAX; 70 NM W WE DECLARED AN EMER WITH ZMA. WE LET DOWN TO 11000 FT OVER CYPRESS ON THE CYS1 ARR TO MIA. WE BRIEFED THE #1 FLT ATTENDANT ON THE POSSIBILITY OF COMPLICATIONS ON LNDG AND INSTRUCTED HER TO BRIEF THE PAX CONTINGENT ON A POSSIBILITY OF LNDG EMER. WE BRIEFED OPERATING MANUAL PROCS; IE; LOSS OF SYS A; ALT GEAR EXTENSION; PNEUMATIC BRAKING; CLIPPED PNEUMATIC BRAKE HANDLE WIRE; OUR PLAN WITH CFR EQUIP ON THE GND AND EVAC SIGNAL WITH #1 FLT ATTENDANT TEST. WE SLOWED THE ACFT; PUT OUT FLAPS TO 25 DEGS; MONITORED SYS A QTY; DOWN TO 1 1/4 GALS; SYS A LOW LEVEL LIGHT ON. THEN 45 NM OUT LOWERED LNDG GEAR. SYS A QTY STABLE 2 GALS. FLAPS 30 DEGS ON FINAL; LANDED THEN TAXIED CLR OF MIA RWY 9R ON TXWYS V TO Y. HELD SHORT RWY 12 CFR EQUIP AND MEN SAID LNDG GEAR AND BAYS CLR OF FLUIDS. TERMINATED EMER PROCEEDED TO GATE.