MBDA SPADA is a CLOS, command to line of sight SAM system. That means, the missile is always dependent on the ground tracking radar, called Fire Control Radar. It is a hodge podge design, the radar is from Thales Raytheon, and some components are American while other European. With the FCR at ground level, and missile being semi active, only targets in line of sight of the FCR can be engaged or fired upon. If FCR is jammed, which will be likely in case of enemy package in range of SPADA, the missile will not lock on the target. The ECCM of the FCR is only basic, and can easily be fooled by Airborne ECCM.
SPADA is an italian license produced Sparrow missile, which itself is obsolete. The other candidates at the time were not semi active homing, but active homing systems, which were lot more capable than SPADA. However, SPADA was selected due to the massive bribes involved starting from ACM Tanveer, Shahid Latif, all the way down to Group Captain Ahmar Shazad, then director OR&D, and now AVM and made DG projects by current chief in sympathy.
The Serviceability of SPADA, not alone its efficacy in the Pakistani theatre, is highly questionable. It is a disaster that nobody dares to investigate
By the way, most of the contracts done by ACM Tanveer, Shahid Latif, and Ahmar Shahzad were corrupt and failed to achieve the desired technical and operational goals. Other projects like IL78, ATCR/PAR, and FALCO are also highly questionable, but instead of the key person being investigated, he has been promoted and rewarded. I guess he keeps the money flowing. Lot of honest people wonder how Ahmar Shazad is surviving till now.