The primary purpose of the abradable lining in the fan case is to
- allow a minimum tip clearance without blade damage.
- reduce leakage of anti-icing air at the blade tips.
- provide an acoustic medium in the fan duct.
Explanation from PART66Online
The abradable lining, often called the fan track liner, is a soft sacrificial layer bonded to the fan case directly over the blade tips. If the tips touch it they cut their own track in the lining instead of being damaged, so the fan can run with a very small tip clearance and less air leaks over the blade tips. On many engines the same panel is perforated and honeycomb-backed, so it also forms part of the acoustic treatment, but that is a secondary role. It plays no part in anti-icing.
B
bucks asked · 11 Jun 2017
how can it reduce noise?
Community Comments (4)
M
Matas24
21 Jun 2017
it's soft, chalk like material disables high frequencies exiting the fan blades
V
vale
25 Jun 2021
I thought the primary purpose was to prevent fan blade tip rubbing against the case, can someone confirm?
C
c.stravopodis
1 Oct 2025
Student here, it does reduce noise, but its main cause is to prevent tip rubbing of the fan blades with the case. To me, answer needs to be switched (Acoustic lining).
H
hugohoarauhoarau
6 Sep 2026
La doublure abradable est connue en nid d'abeille, en résine synthétique ou en plastique qui réduit le bruit.
Il est fait également pour être poncé par les ailette de compresseur afin d'évité un espace.
Il est fait également pour être poncé par les ailette de compresseur afin d'évité un espace.
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