PILOT DEFECT REPORT (PDR) for status message “STAB POS XDCR” previous leg.

It could that be indicating anything deeper brewing 

Further to my last post, I have something important that I present here this time for your kind read and perusal. The efforts as always are solely to keep the AI171 memory still active and try finding plausible hypotheses / likely pathways. This is an independent, personal,unofficial analysis. 

I bring in here an important point on the stabilizer fault reported and logged in the previous leg of the same Aircraft.

The AAIB preliminary report does note that VT-ANB had a stabilizer indication fault on the prior inbound leg (DEL–AMD-AI423), which was subsequently cleared by ground maintenance. 

Thus from a 787 systems perspective:

1) The stabilizer trim system is electrically powered and tightly integrated with the aircraft’s primary flight-control electronics and power distribution.

2) A stabilizer fault can therefore likely be symptomatic of deeper intermittent electrical issues — for example, actuator load anomalies or control-channel instability — that may not always necessarily be resolved by a quick turnaround fix. There remains a rare possibility of it recurring. If such a fault reappeared during rotation, it could potentially trigger or accelerate the sort of electrical cascade we see in AI171.

3) One should not entirely rule out the possibility that the stabilizer fault possibly itself acted as an initiator, not merely a symptom. The stabilizer system draws significant electrical power and is tied into the common-core distribution; a short, overcurrent, or spurious demand signal during rotation could destabilize bus voltages.

4)A stabilizer actuator that suddenly demands abnormal electrical load, or a control channel that becomes unstable, can cause a sharp current spike or voltage disturbance on the aircraft power buses. On a highly integrated aircraft like the 787, such a disturbance can propagate quickly, confusing control logic and momentarily depriving critical relays and controller inputs of stable power. In that transient, the FADEC could respond by closing fuel metering, or the FSOV control path could be interrupted so that fuel supply is removed — either pathway would result in rapid engine power loss.

For context, the AAIB preliminary report (page 13) records that the crew of the previous flight (AI423) logged a Pilot Defect Report (PDR) for status message “STAB POS XDCR”, troubleshooting was carried out per FIM by Air India’s on-duty AME, and the aircraft was released for the following sector at 0640 UTC.

STAB POS XDCR by itself is unlikely to be the direct electrical “big bang” that knocks out aircraft power, but the broader stabilizer subsystem failures that this code can signify may initiate or accelerate an electrical cascade.