Air carrier flight crew reported the DG acknowledgement message was not sent before gate pushback.
Synopsis
Air carrier flight crew reported the DG acknowledgement message was not sent before gate pushback.
Narrative
During preflight duties on the flight deck; and just as boarding commenced; we felt that the preconditioned (PC) air attached to the aircraft was providing hot air and making the cabin and flight deck uncomfortable. We asked ops to have the PC air removed. Instead; the ground power was removed. (APU not running). The subsequent power loss caused a major disruption to the FMC loading as well as failure of data received via datalink in the ACARS system. The APU was started; and after several minutes; systems recovered. The ACARS had to be reinitialized; as well as the FMC reprogrammed. All systems appeared to operate normally. As push back; commenced; we received a notice that Dangerous Goods (DG) was not acknowledged. We called operations to confirm there was no dangerous goods onboard; as we had not received any notification of such; preliminary or final. After a while; they reported that we did in fact have DG onboard. We asked for the notification in print; and operations sent it to our printer. At that time we acknowledged verbally with operations; as the dangerous goods acknowledgement code; after pushing back; received no conformation. Our conclusion was that perhaps the notification was sent during our power outage; and it was not received by the aircraft. We confirmed this by reviewing on the Comms page; that indeed; no DG messages had been received.
Second reporter narrative
While preflighting the aircraft; we called operations to have the external air disconnected because it was hot on the airplane. With no notification; the aircraft went dark as the ground crew disconnected external power. We started the APU and waited for the airplane to boot back up. We reinitialized ACARS and reprogrammed the FMC. Everything appeared normal. We received no notification of Dangerous Goods (DG). Upon pushing back; we received an ACARS message stating DG was not acknowledged. After calling operations to have our DG summary sent; we acknowledged it both with a dangerous goods acknowledgement code and verbal acknowledgment to operations.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.