Just for a heads-up on the E-4B.....
Boeing Delivers Refurbished E-4B to U.S. Air Force
(Source: Boeing Co.; issued Sept. 21, 2007)
"ST. LOUIS --- The Boeing Company recently delivered a refurbished E-4B National Airborne Operations Center to the U.S. Air Force Strategic Command after completing programmed depot maintenance (PDM) at its modification center in Wichita, Kan.
'With a small fleet of four aircraft, it is critical that we deliver this important national asset on cost and on schedule per the commitments we've made to our customer,' said Andy Reheis, Boeing E-4B program manager. [.....]
Programmed depot maintenance ensures that the aircraft receives the repairs and systems upgrades it needs to operate effectively and meet Federal Aviation Administration safety requirements."
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Photo © Nik Deblauwe
I don't know if it's this particular bird since the date on the photo is quite recent. How long does a PDM usually take?