3) Do flight planning with all available information that includes: Volcanic Ash Advisory
Center (VAAC) and meteorological (MET) office volcanic ash advisories and other
sources of flight planning information such as FAA Flight Service Stations or other
agency guidelines and/or pilot reports. Operators should monitor the position of the
visible or discernable ash cloud and forecasted movement to permit night/IMC
operations.
4) Operations in an area with predicted ash concentrations of higher than 2,000
micrograms/m3 (2.0 milligrams/m3) can be done at the operators' discretion, if you
try not to do operations in visible or discernible ash.
5) Minimize reverse thrust use on ash or sand contaminated runways especially at
lower speeds.
(2) Volcanic Ash/Sand Ingestion Inspection
(a) If smell or other non-visual indication of volcanic ash/sand has been reported, do this
step:
1) Examine the engine inlet and exhaust for volcanic ash/sand that collects in the
engine. If you do not see any volcanic ash/sand, no further action is needed. If you
see volcanic ash/sand, you must continue with step below.
(b) If the engine has flown through or operated in volcanic ash/sand, either visual or
suspected for other reasons, do these steps:
1) Visually examine the engine inlet and exhaust areas for signs of damage or an
unusual amount of erosion.
2) Do the borescope inspection of the high pressure compressor and the high
pressure turbine, look for the damage that follows:
a) An unusual amount of erosion
b) Foreign object damage (FOD)
c) Build-up of ash/sand deposits.
3) Do the steps that follow for the Oil System:
a) Replace the scavenge oil filter (TASK 79-21-08-034-001-G00 and
TASK 79-21-08-434-011-G00).
b) Drain and replace the oil (TASK 79-11-00-603-023-G00).
(c) If the engines have been exposed to volcanic ash/sand that you can see on the ground or
in the air around the engine but have not flown through it or operated in it, do these steps:
1) Examine the engine inlet and exhaust for volcanic ash/sand that collects in the
engine.
a) Vacuum the volcanic ash/sand from all areas you can access in the engine
inlet and exhaust.
2) Dry motor the engine for 2 minutes (TASK 71-00-00-802-136-G00).
3) Wait for 10 minutes and then dry motor the engine for 2 minutes
(TASK 71-00-00-802-136-G00).
4) Within 10 cycles, do the borescope inspection of the high pressure compressor and
the high pressure turbine.
5) If you find damage or there is an indication of volcanic ash/sand in the engine, do
this task: Flush the Engine Oil System (TASK 79-11-00-603-023-G00).
(d) Continue to use the engine
767
AIRCRAFT MAINTENANCE MANUAL
CF6-80A SERIES ENGINES
72-00-00
NoC
Page 666
D633T1B7 Aug 22/2017
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ABX 001-007, 011, 012, 016-019, 021, 022, 025, 101,
109, 114, 115, 314-999
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