Start with the fact that the aircraft had a large cargo of lithium batteries. The book mentioned has interesting theory, and is as likely as anything else. It's just that she has no solid info either.
Talking about lithium batteries, just got an email from Fedex and they have decided to publish a new specific variation in next year IATA DG regulation under FX-05. Not sure it will change much in case of a fire...but batteries will now need to be packed according to Group I packaging instead of Group II.
[TABLE="class: m_567273404436046401mobilepadded, width: 600"][TR][TD="class: m_567273404436046401mobile, width: 428, align: left"][TABLE="width: 100%"][TR][TD][TABLE="width: 100%"][TR][TD][TABLE="width: 100%"][TR][TD="class: m_567273404436046401intro, align: left"]FedEx Express policy change on lithium battery shipments (Effective January 1, 2017) (Updated)[/TD][/TR][TR="class: m_567273404436046401mobilepadded"][TD="align: left"]
[/TD][/TR][/TABLE][/TD][/TR][/TABLE][/TD][/TR][/TABLE][/TD][TD="class: m_567273404436046401hideonmobile, width: 27, align: left"]
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[/TD][TD="width: 428, align: left"][TABLE="width: 100%"][TR][TD][TABLE="width: 100%"][TR][TD][TABLE="class: m_567273404436046401mobilepadded, width: 100%"][TR][TD]Effective January 1, 2017, FedEx Express will no longer accept stand-alone lithium-metal batteries (categorized as UN 3090) or stand-alone lithium ion batteries (categorized as UN 3480) that have been prepared as IATA Section II shipments. Instead, shipments containing UN 3090 or UN 3480 lithium batteries must be offered as fully regulated IATA Section IA or IB shipments*, with a Shipper's Declaration for Dangerous Goods (DG) and all required Dangerous Goods markings and labeling.
UN 3090 and UN 3480 Section IA/IB are fully regulated Class 9 Dangerous Goods and classified as Inaccessible Dangerous Goods (IDG). FedEx Express service options are allowed for IDG*, and an IDG surcharge will apply.
Customers who ship lithium metal batteries (UN 3090) with FedEx must be pre-approved by FedEx Express to comply with the FedEx operator variations in IATA Dangerous Goods Regulations. Customers who were previously approved by FedEx to be on the UN 3090 Section II list will automatically be placed on the UN 3090 Section IA/IB list*.
The new policy changes will not impact UN 3091 or UN 3481 (lithium metal/ion batteries contained in or packed with equipment).
When the mark/label is required, customers have the choice of using either the Lithium Battery Mark (Figure 7.1.C in the 58th edition of IATA Dangerous Goods Regulations), which goes into effect on January 1, 2017, or the existing Lithium Battery Handling Label (Figure 7.4.H in the 58th edition of IATA Dangerous Goods Regulations), which can continue to be used until December 31, 2018. As of January 1, 2019, only the Lithium Battery Mark (IATA Figure 7.1.C) can be used.
Please note that the UN number must be placed on the IATA Lithium Battery Mark (IATA Figure 7.1.C), whereas the UN number should be placed on the package adjacent to Lithium Battery Handling Label (IATA Figure 7.4.H). The process of placing the UN number adjacent to the Lithium Battery Handling Label (IATA Figure 7.4.H) will be a FedEx mandatory requirement as of July 1, 2017, as per FedEx variation 'FX-05' to the IATA DG Regulations 58th edition.[/TD][/TR][/TABLE][/TD][/TR][/TABLE][/TD][/TR][/TABLE][/TD][/TR][/TABLE]