Handling, Servicing & Maint.
Pilot's Flight Manual
Reissued: 16 Jan 2019 7-17
Move he li cop ter on ground by man u ally bal anc ing on
ground han dling wheels and push ing on tail ro tor trans mis -
sion hous ing and any other sturdy struc tural mem bers of he -
li cop ter (i.e. cabin back struc ture, steel tube cen ter frame,
land ing gear cross beams, etc.).
7-16. CABIN HEATER-Muff-Type Us ing En gine Cool ing Air Source
(269A4451-101/-103/-109 inst’l.)
With this in stal la tion, warm air is taken from the en gine ple num and
vented through the heater muff for ad di tional heat ing. The heated
air is then vented through the valve box and into the cabin. The
cabin heat is reg u lated by a con trol le ver that is mounted be tween
the cabin seats. Through the con nect ing ca ble, this le ver con trols the
air flow through the valve box. With the le ver in OFF po si tion, un -
wanted hot air is re leased to the at mo sphere from the valve box.
To in crease heater life and re duce ro tor craft empty weight, it is rec -
om mended that the muff-type cabin heater be re moved and re placed
with an ap proved ex haust sys tem dur ing warm weather op er a tion.
To re move the heater muff and leave pro vi sions in stalled, re fer to
HMI Ap pen dix A. When the muff-type heater is re moved, the air
duct be tween the con trol box and the heat dis tri bu tion ple num must
be re moved and the open ing in the ple num must be suit ably capped.
7-17. HOURMETER IN STAL LA TIONS
One stan dard and two op tional hourmeter in stal la tions are of fered
on the Model 269C-1 He li cop ter.
1. In the stan dard hourmeter in stal la tions, the hourmeter is ac tu -
ated by main trans mis sion oil pres sure. The hourmeter will run
and re cord time when ever the main ro tor trans mis sion oil pres -
sure is above the min i mum value (main ro tor turn ing, warn ing
light out). When this in stal la tion is uti lized, no mul ti ply ing fac -
tor is re quired when the re corded time is used to de ter mine pe ri -
odic in spec tion re quire ments over haul in ter vals, and the ser vice
life of life lim ited com po nents.
2. In the op tional land ing gear ac tu ated hourmeter in stal la tion, the
hourmeter is ac tu ated by a “squat” switch at tached to the land -
ing gear. The hourmeter will run and re cord time when ever the
air craft is in flight (no weight on the land ing gear). This in stal -
la tion re cords “flight time”, or “time in ser vice” as de fined in
SCHWEIZER
Model 269C-1 Helicopter
CSP book 2..indd 155 8/4/19 12:54 PM
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